IC-746PRO Amateur HF \ VHF Scanning Transceiver Manual Part 1 Users Manual

 

INSTRUCTION MANUAL HF/VHF ALL MODE TRANSCEIVER i746PRO This device complies with Part 15 of the FCC rules. Operation is sub-

ject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. FOREWORD PRECAUTIONS We understand making you have a choice of many dif-

ferent radios in the market place.I want to take a cou-

ple of moments of your time to thank you for making your IC-746PRO your radio of choice, and hope you agree with Icoms philosophy of technology rst.Many hours of research and development went into the de-

sign of your IC-746PRO. Rather than completely redesigning all areas to create a new radio, the engineering team at Icom decided to follow in the footsteps of the IC-746 (one of the best values in the marketplace) with the new PRO. Fo-

cused on real world improvements compiled over the last few years from letters, phone calls, E-Mails and newsgroup postings the engineering team at Icom is proud to say many of these changes were compiled from a list of suggestions from you, the amateur radio operator!

FEATURES 32-bit Floating point DSPand 24-bit AD/DAconverter DSPIFFilter creates 102 types of lter types All mode capability covering 1602m 100 Watt continuous duty cycle All mode digital modulation and demodulation RTTYdemodulator and decoder Twin Pass Band Tuning RFspeech compression with selectable pass band Microphone Equalizer SSB/CW synchronous tuning EXPLICIT DEFINITIONS INSTRUCTION MANUAL READ THIS CAREFULLY before attempting to operate the transceiver. SAVE THIS INSTRUCTION MANUAL. This manual contains important safety and operating in-

structions for the IC-746PRO. EXPLICIT DEFINITIONS WORD DEFINITION RWARNING Personal injury, re hazard or electric shock may occur. CAUTION Equipment damage may occur. NOTE If disregarded, inconvenience only. No risk or personal injury, fire or electric shock. i R WARNING RF EXPOSURE! This device emits Radio Frequency (RF) energy. Extreme caution should be observed when operating this device. If you have any questions regarding RF exposure and safety standards please refer to the Federal Communications Commission Ofce of Engineering and Technologys report on Evalu-

ating Compliance with FCC Guidelines for Human Radio frequency Electromagnetic Fields (OET Bulletin 65). R WARNING HIGH VOLTAGE! NEVER attach an antenna or internal antenna connector during transmis-

sion. This may result in an electrical shock or burn. R NEVER apply AC to the [DC13.8V] jack on the trans-

ceiver rear panel. This could cause a re or ruin the trans-

ceiver. R NEVER apply more than 16 V DC, such as a 24 V battery, to the [DC13.8V] jack on the transceiver rear panel. This could cause a re or ruin the transceiver. R NEVER let metal, wire or other objects touch any in-

ternal part or connectors on the rear panel of the trans-

ceiver. This may result in an electric shock. NEVER expose the transceiver to rain, snow or any liquids. AVOID using or placing the transceiver in areas with tem-

peratures below 10C (+14F) or above +50C (+122F). Be aware that temperatures on a vehicles dashboard can exceed 80C (+176F), resulting in permanent damage to the transceiver if left there for extended periods. AVOID placing the transceiver in excessively dusty envi-

ronments or in direct sunlight. AVOID placing the transceiver against walls or putting anything on top of the transceiver. This will obstruct heat dissipation. Place unit in a secure place to avoid inadvertent use by children. During mobile operation, DO NOT operate the transceiver without running the vehicles engine. When transceiver power is ON and your vehicles engine is OFF, the vehi-

cles battery will soon become exhausted. Make sure the transceiver power is OFF before starting the vehicle. This will avoid possible damage to the trans-

ceiver by ignition voltage spikes. During maritime mobile operation, keep the transceiver and microphone as far away as possible from the magnetic navigation compass to prevent erroneous indications. BE CAREFUL! The heatsink will become hot when oper-

ating the transceiver continuously for long periods. BE CAREFUL! If a linear amplier is connected, set the transceivers RF output power to less than the linear am-

pliers maximum input level, otherwise, the linear ampli-

er will be damaged. Use Icom microphones only (supplied or optional). Other manufacturers microphones have different pin assign-

ments, and connection to the IC-746PRO may damage the transceiver. TABLE OF CONTENTS FOREWORD ........................................ i IMPORTANT ........................................ i EXPLICIT DEFINITIONS ..................... i PRECAUTIONS ................................... i TABLE OF CONTENTS ...................... ii QUICK REFERENCE GUIDE ........ I X I Installation ....................................... I I Operation ....................................... III I Your rst contact ........................... IV I Ready to call CQ? ......................... IX 1 PANEL DESCRIPTION ........... 112 I Front panel ..................................... 1 I Rear panel ...................................... 7 I LCD display .................................... 9 I Multi function switches .................. 11 I Microphone (HM-36) .................... 12 2 INSTALLATION AND CONNECTIONS ................... 1317 I Unpacking .................................... 13 I Selecting a location ...................... 13 I Grounding ..................................... 13 I Antenna connection ...................... 13 I Required connections ................... 14 I Advanced connections ................. 15 I Power supply connections ............ 16 I Linear amplier connections ......... 17 I External antenna tuner connection .................................... 17 3 BASIC OPERATION ............. 1825 I When rst applying power

(CPU resetting) ............................. 18 I Initial settings ................................ 18 I Selecting an operating band ........ 19 I Selecting VFO/memory mode ...... 20 I VFO operation .............................. 20 I Frequency setting ......................... 21 I Operating mode selection ............ 23 I Volume setting .............................. 23 I Squelch and receive (RF) sensitivity ...................................... 24 I Basic transmit operation ............... 25 I Electronic keyer functions ............ 29 I Operating RTTY (FSK) ................. 35 I RTTY functions ............................. 36 I Operating AM ............................... 40 I Operating FM ............................... 41 I Repeater operation ....................... 44 5 FUNCTIONS FOR RECEIVE

........................................... 4754 I Simple band scope ....................... 47 I Preamp/Attenuator ....................... 48 I RIT function .................................. 48 I AGC function ................................ 49 I IF lter selection ........................... 50 I IF (DSP) lter shape ..................... 51 I Noise blanker ............................... 51 I Meter peak hold function .............. 51 I Twin PBT operation ...................... 52 I Noise reduction ............................ 53 I Notch function .............................. 53 I Dial lock function .......................... 53 I Voice squelch control function ...... 54 6 FUNCTIONS FOR TRANSMIT

........................................... 5561 I VOX function ................................ 55 I Break-in function .......................... 56 I TX function ................................ 57 I Monitor function ............................ 57 I Speech compressor ..................... 58 I Transmit lter width selection ....... 58 I Split frequency operation .............. 59 I Quick split function ....................... 60 I Measuring SWR ........................... 61 7 MEMORY OPERATION ........ 6268 I Memory channels ......................... 62 I Memory channel selection ............ 62 I Programming a memory ............... 63 I Memory clearing ........................... 63 I Selecting the call channel ............. 64 I Programming the call channel ...... 64 I Frequency transferring ................. 65 I Programming scan edges ............ 66 I Assigning memory names ............ 67 I Memo pads ................................... 68 4 RECEIVE AND TRANSMIT .. 2646 I Operating SSB ............................. 26 I Operating CW ............................... 27 8 SCANS ................................. 6974 I Scan types .................................... 69 I Preparation ................................... 69 I Voice Squelch control function ..... 70 I Scan set mode ............................. 70 I Programmed scan/Fine programmed scan .............................................. 71 I Memory scan operation ................ 72 I Select memory scan ..................... 72 I F scan operation and Fine F scan

...................................................... 73 I Tone scan/DTCS code scan operation ...................................... 74 9 ANTENNA TUNER OPERATION

............................................ 7577 I Antenna connection and selection 75 I Antenna tuner operation ............... 76 I Optional external tuner operation . 77 10 DATA COMMUNICATION ..... 78 80 I Connections ................................. 78 I Packet (AFSK) operation .............. 79 I Adjusting the TNC output level ..... 80 I Data transmission speed .............. 80 11 SET MODE ............................ 8189 I General set mode ......................... 81 I Tone control set mode .................. 89 12 OPTION INSTALLATION ..... 90 91 I Opening the transceivers case .... 90 I UT-102 VOICE SYNTHESIZER UNIT ... 90 I CR-338 HIGH STABILITY CRYSTAL UNIT

..................................................... 91 13 MAINTENANCE .................... 9294 I Trouble shooting ........................... 92 I Fuse replacement ......................... 93 I Tuning dial brake adjustment ....... 93 I Resetting the CPU ........................ 94 I Frequency calibration (approximate)

..................................................... 94 14 CONTROL COMMAND ......... 9599 I Remote jack (CI-V) information .... 95 15 SPECIFICATIONS ...................... 100 16 OPTIONS.................................... 101 SUPPLIED ACCESSORIES The transceiver comes with the following accessories. Qty. q DC power cable (OPC-025D) ............................ 1 w Hand microphone (HM-36) ................................ 1 e Spare fuses (FGB 30 A) .................................... 2 r Spare fuse (FGB 5 A) ........................................ 1 t CW keyer plug (AP-330) .................................... 1 q w e r t Icom, Icom Inc. and the dom, Germany, France, Spain, Russia and/or other countries. are registered trademarks of Icom Incorporated (Japan) in the United States, the United King-

ii QUICK REFERENCE GUIDE I Installation 1. Install a ground system for DC noise suppression and RFI suppression 2. Install your DC power supply 3. Install lightning protection. This will help protect more than your gear. 1. Grounding your Shack Although your radio will operate by connecting the DC power supply and antenna, it is necessary to have a good ground system in your shack. A ground connec-

tion is the electrical contact between the common point of an electrical or electronic system and the earth. A good earth ground is necessary to prevent electrical shock, eliminate problems from RFI and DC noise. With more electronic devices being used today, it is also important to reduce RFI and EMI. Although you may not see interference in your shack, without a grounding system, your neighbors may experience in-

terference. Even though many of these devices are part 15, where they must accept interference from their surrounding environment, it is best to eliminate as much of the possible interference from your shack. If you do not have a grounding system for your shack, depending on the location of your shack, basement or ground oor, a good ground system can be as simple as a couple of ground rods driven 6 to 8 feet into the soil. When installing your IC-746PRO to your ground-

ing system, the shortest most direct connection is rec-

ommended. 2. Installing your DC Power Supply The DC power supply is a device used to convert 110/220 V AC, also know as Household current, to a steady source of 12 V DC. The perfect match to your IC-746PRO is the PS-125. This compact switching power supply is the matching power supply for your IC-746PRO with a current rat-

ing of 25 A continuous duty. This plug and play unit;

plugs into the DC jack located on the rear of the radio. PS-125 DC power socket Transceiver DC power cable Connect to an AC outlet using the supplied AC cable. I 4. Install and connect an antenna system for the ap-

propriate bands of operation 5. Connect other peripheral equipment. This includes microphones, headsets, TNC, amplifiers and any other equipment necessary to make your shack complete. NOTE: There are many publications covering proper grounding techniques. Check with your local dealer for more information and recommendations. D Some Symptoms if inadequate grounding a. Poor DC Ground 60 Hz hum on the audio either Rx or Tx without the antenna connected. If you feel a tingling sensation when you touch a metal surface. Surfaces such as the cover of your radio or power supply. b. Poor RF Ground While transmitting and you feel a tingling sensation when you touch a metal surface. Surfaces such as the cover of your radio or power supply. While transmitting, you experience interference to other electronic devices, such as the telephone, television or stereo audio systems. If you are not using the PS-125:

Connect the supplied DC power cable (OPC-025D) to the appropriate color coded terminals, then insert the DC connector into the DC jack located on the rear of the radio. AC outlet A DC power supply*

to DC power socket Transceiver Black _ Red

+

AC cable 30 A fuses Supplied DC power cable

*13.8 V; at least 23 A NOTE: Although the power supply current require-

ment is quite low during receiving, this not the case when you transmit. With many electrical devices in the shack, it is very important to verify the electrical circuit is not overloaded. 3. Installing lightning protection Although you may not live in an area with high occur-

rence for lightning storms, it is always wise to take precautions for lightning or static discharges. Proper lightning protection not only offers protection to the ham gear, but the shack and most importantly the op-

erator. 4. Installing your antenna system Whether your IC-746PRO is your rst radio or one of many, one of your key elements in a great shack is the antenna system. There are three connections on the back of your IC-746PRO, two for HF and 6 m and one for 2 m. If you are using one antenna for HF and 6 m, for simplicity, connect the antenna coax to ANT1. ANTENNA 1, 2

[Example]: ANT1 for 1.818 MHz bands ANT2 for 2150 MHz bands QUICK REFERENCE GUIDE NOTE: There are many publications covering proper lightning protection, check with your local dealer for more information and recommendations. Antenna SWR Each antenna is tuned for a specified frequency range and SWR may be increased out-of-range. When the SWR is higher than approx. 2.0:1, the transceivers power drops to protect the nal tran-

sistor. In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR al-

lows full power for transmitting even when using the antenna tuner. The IC-746PRO has an SWR meter to monitor the antenna SWR continuously. PL-259 CONNECTOR INSTALLATION EXAMPLE q 30 mm Slide the coupling ring down. Strip the cable jacket and soft solder. Coupling ring 10 mm (soft solder) 144 MHz ANTENNA Connect a VHF (60144 MHz) antenna; impedance: 50 . Your IC-746PRO is equipped with an internal antenna tuner (ATU) for operation on 1606 m. This ATU is de-

signed to work with an unbalanced 50 feedline. The purpose of the internal antenna tuner is match the im-

pedance of your antenna system to as close to a 50 load as possible. This ATU will not operate with a long wire or ladder line (450 or balanced feed-

lines). An external ATU such as the AH-4 would be necessary for this kind of operation. w e r 10 mm Soft solder 12 mm solder solder Strip the cable as shown at left. Soft sol-

der the center con-

ductor. Slide the connector body on and solder it. Screw the coupling ring the connector body. onto 30 mm 98 in 10 mm 38 in 12 mm 116 in R WARNING: Although a mag mount antenna works great on a vehicle, DO NOT use with IC-

746PRO on this type of antenna. CAUTION: Although your IC-746PRO has protec-

tion to drop down power with a high SWR, this does not completely protect the transceiver from transmission without an antenna. Make sure you have an antenna connect whenever you transmit with your radio. NOTE: There are many publications covering proper antennas and their installation, check with your local dealer for more information and recom-

mendations. II QUICK REFERENCE GUIDE 5. Connect other peripheral equipment Everyone has his or her favorite ad-on gear; now is the time to connect this gear! We will cover the basic devices that can be connected to your IC-746PRO. I Operation 1. Voice Microphones: Connect it to the eight-pin connector on the front of the radio. If you do not see the particular item you are wanting to connect, refer to the Advance Connections section starting on page 15. MICROPHONES HM-36 SM-20 2. CW CW Key: There are several types of keys or keyers that can be used with your IC-746PRO. a. Lambic Key paddle: Use a 6.35(d) mm (14) stereo plug and connect to the [ELEC-KEY] jack lo-

cated on the front of the radio. b. Straight Key: Use a 6.35(d) mm (14) mono plug and connect key to the back of the radio. c. External Keyer: Use a 6.35(d) mm (14) mono plug and connect to the back of the radio. d. Computer Keying: Use a 6.35(d) mm (14) mono plug and connect to the back of the radio. CW KEY STRAIGHT KEY

(dot)

(com)

(dash)

(+)

(_) A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p.34) NOTE: You will need to select the type of keyer you are using in the Keyer Set mode. There are many advanced CW functions in this set mode, until you have a full understanding of these functions change only the items necessary. III QUICK REFERENCE GUIDE 3. Other convenient items Headphones:

A 6.35(d) mm (14) mono jack for operation without using the internal or external speakers. Perfect for op-

eration without disturbing others in the room. External Speaker:

A 3.5(d) mm (18) mono jack for operation with an ex-

ternal speaker. (Input impedance: 8 /Max. input power: 5 W) HEADPHONES EXTERNAL SPEAKER SP-21 (optional) I Your rst contact Now you should have your IC-746PRO installed in your shack, and like a kid on his birthday, you are probably excited to get on the air. We would like to take you through a few basic operation steps to make your rst On The Air an enjoyable experience. D Turning on the radio 1. Before powering up your radio, you may want to make sure the following controls are set in the fol-

lowing positions:

[AF]

[NR]

[MIC GAIN]

[RF/SQL]

[CW PITCH]

: Commonly referred to as the vol-

ume: fully CCW.

: The noise reduction control: fully CCW.

: The mic gain: fully CCW.

: The control for the RF Gain and Squelch circuits: 12 oclock.

: The control for the CW pitch:

12 oclock.

[KEY SPEED] : Internal CW Keyer Speed: fully

[NOTCH]

CCW

: Control for the manual notch:

12 oclock 2. Resetting the CPU: Although you have purchased a brand new radio, some settings may be changed from the factory defaults from the CQ process. So your radio can start from Factory Defaults resetting the CPU is necessary.

[POWER]

[F-INP] [M-CL]

IV QUICK REFERENCE GUIDE D Just listening 1. Select the desired band Your IC-746PRO easy way of changing bands using the keypad located just above the tuning knob on the right hand side of the display. You will notice each switch has two sets of numbers; one set of numbers represents the band selection. Say you want to go to 20 meters or 14 MHz; you would push the [14 5]. This will immediately change the displayed operating frequency to the 20-meter band. This system is the triple band stacking regis-

ters. For more details on this system refer to p. 19. 1.8 1 3.5 2 7 3 10 4 14 5 18 6 21 7 24 8 28 9 GENE 50 0 144 ENT 2. Tune to the desired frequency Directly below the keypad is the tuning knob. This will allow you to dial in the frequency you want to oper-

ate. You will notice the tuning speed [TS] is 10 Hz res-

olutions. Page 22 will instruct you on how to set the tuning speed [TS] for 1 Hz resolution. NOTE: Although you can directly enter the fre-

quency with the keypad, using the Band Stacking Registers and the tuning knob is the most popular method of hoping around the bands. For more in-

formation regarding the direct frequency entry method, refer to p. 22. 3. Verify proper antenna has been selected. You IC-746PRO has three antenna connectors. Two for HF and 6m and a one for 2m. The selection for 2m is automatic, where the HF and 6m is user selectable for either one of the antenna jacks. For the rst time use, the antenna selector should show on the display of your radio. Verify the antenna selected on the display is the antenna port your connected your antenna. 4. Adjust audio output Adjust this control to a comfortable audio level. V Either 1 or 2 appears.

*No indicator appear during 144 MHz operation. AF RF/SQL Decreases Increases No audio output Max. audio output D What are you hearing?

Stop and focus on what you are hearing. Do you hear a lot of noise? Is the signal intelligible? Are you set up for the right mode? How about the lters?

1. Verify mode Although your IC-746PRO will automatically select USB or LSB in the HF bands, it will not select any of the other modes. You will need to select the proper mode whether CW, RTTY, AM or FM. QUICK REFERENCE GUIDE SSB CW/RTTY AM/FM Hint!

The Triple Band Stacking Registers will memorize the last three frequencies used in the band, as well as the Mode, Filter, Tuner and AGC settings. Mak-

ing band hoping much easier. 2. Reducing interference Your IC-746PRO has many features to reduce QRM and QRN from the desired signal. a. Noise Reduction: The noise reduction system on your IC-746PRO is part of the 32-bit DSP. This is used to reduce the hiss and QRM levels. To acti-

vate, push the [NR] switch located just to the right of the [PHONES] jack. NR NOTCH Decreases Increases OFF Noise reduction ON Noise reduction OFF

[NR]

[NR]

A G C D U P C M P T B W S C P Appears b. Adjusting the Noise Reduction: The noise re-

duction is completely variable on how much of the DSP Noise Reduction is used. Located just above the [NR] switch, this is where the [NR] level con-

trol. Hint!

How much [NR] will depend on the S/N ratio, Signal to Noise. Just using the [NR] may cause the signal to become distorted. To keep this from happening, using the [NR] along with the [RF GAIN] and Filter bandwidths will allow you to zero in on the desired signal with as little QRM as possible. VI QUICK REFERENCE GUIDE c. Notch: There are two notch systems on your IC-

746PRO. Automatic:The automatic notch will track up to three heterodynes. This is great for eliminating hetero-

dynes on 80 and 160 meters, and those annoying tune up signals across the band. Once selected an icon will appear A NOTCH on the display. Hint!

The Automatic Notch will not operated in the SSB data, CW or RTTY modes. Manual:The Manual notch provides 70 dB of atten-

uation to pin point an interfering signal. The 12 o-

clock position is on the operating frequency, turning the Notch knob clockwise moves the notch up the band and counter clockwise will move the notch down the band. Once selected an icon will appear NOTCH on the display. NR NOTCH Low freuency High frequency d. Filters: Your IC-746PRO has an incredible IF DSP based lter network with over 100 settings. Dial in your filters: By pushing [FILTER] for 1 sec., you enter the lter set mode. This is where you are able set the three lter presets. Across the bottom of the display you will see the BW icon. The switch di-

rectly below, along with the tuning dial, will be used to select the changes you will make.

[A/NOTCH]

[NOTCH]

A G C D U P C M P T B W S C P Notch function indicators NOTE: Your IC-746PRO is equipped with multiple AGC circuits. This allows the DSP to lter out inter-

fering signals and QRM, while also taking this in-

terference out of the AGC. Bottom line, this will ei-

ther eliminate or greatly reduce the pumping of the AGC from the interfering signal. Filter set mode indication B W Shows the selected filter and passband width. Indication while setting B W

[FILTER]

Reverses Appears While pushing [F1 BW], rotate the tuning dial to set passband width. A G C D U P C M P T B W S C P The selected filter width is indicated for approx. 1 sec. when [FILTER] is pushed. Filter selection VII QUICK REFERENCE GUIDE PBT operation example

[TWIN PBT] control d. Filters: continued On the fly adjustment: Once the adjustments have been made in the lter set mode, you can make on the y changes by using the Twin Pass Band Tuning, Twin PBT. You will be able to see the effects of the Twin PBT on the upper left hand side of the screen. One of 1, 2 or 3 is displayed for selected filter number indications. NOTE: The Twin PBT filters shift the two IF DSP lters (See Diagrams below and right). This feature allows both an IF shift as well as a narrowing of the Pass Band. Although you can narrow the pass band by shifting the two lters, this does not nar-

row both filters, thus the filter shape is not nar-

rowed. You may hear some signal artifacts pass through this lter adjustment.

[PBTC]

A G C D U P C M P T B W S C P Passband width and shifting value are indicated while [TWIN PBT] is operated. Filter set mode indication Appears when PBT is used. B W Shows the selected filter and passband width. Indication while PBT setting B W Appears when passband is shifted.

*Pushing [PBTC] for 1 sec., the shifted value return to default setting and the dot disappears. Center Passband Passband IF shift pass band IF center frequency interference desired signal inteference desired signal IF center freq. interference VIII QUICK REFERENCE GUIDE 3. RX Tone Control:

Once you have mastered your lter settings, one last feature to enable the most intelligible audio is the ac-

tual audio tone you hear. You can adjust the equal-

ization of your received audio 5dB. q Push [MENU] several time, or until M2 is shown on the display. w Push [F4 TCN] for the Tone Control set mode. e Push the appropriate mode switch to adjust SSB, AM or FM.

[F1 ]

[F2 ] [F4 TCN]

r Push [F1 ] or [F2 ] to change to the desired

[MENU]

Tuning dial component. 1. RX Bass This item adjusts the bass level of the receive audio tone from 5 dB to +5 dB in 1 dB steps. 2. RX Treble This item adjusts the treble level of the receive audio tone from 5 dB to +5 dB in 1 dB steps. We hope these pointers have been helpful. Now you are ready for the Ready to call CQ?. I Ready to call CQ?

[NR]: Max. CCW

[NOTCH]: Max. CCW R X B a s s S S B 3 O R X T r e b l e S S B 4 O

[TRANSMIT]: OFF i746PRO TUNER ANT NR NOTCH POWER TRANSMIT PHONES NR A/NOTCH ELEC-KEY AF RF/SQL

[AF]: Max. CCW MIC

[RF/SQL]: 12 oclock

[MIC GAIN]: Max. CCW HF/VHF TRANSCEIVER TWIN PBT 1.8 1 3.5 2 7 3 10 4 14 5 18 6 F-INP 21 7 24 8 28 9 SPLIT GENE 50 0 144 ENT A/B MP-W TX XFC MP-R TS RX LOCK PBTC MW V/M M-CL M-CH RIT TX CLEAR RIT/TX F 1 F 2 F 3 F 4 F 5 MENU SSB CW/RTTY AM/FM FILTER MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR CALL LOCK/

SPCH

[RF PWR]: Max. CCW

[CW PITCH]: 12 oclock

[KEY SPEED]: Max. CCW 1. Setting up your transmit audio The 32-bit DSP in your IC-746PRO is capable of giving you the type of transmit audio for your SSB Operation. 2. Mic Gain The microphone gain is used for proper transmit audio level for full output power. Although the hand microphone supplied with your IC-746PRO should re-

IX quire a setting of the [MIC GAIN] you should find a 1011 oclock position. 3. DSP TX Audio Pass Band The capable of changing the pass band of your trans-

mit audio, is at your nger tip. Regardless of the con-

dition of the speech compressor, you can adjust by selecting the [F4 TBW]. You will nd this located on the M1 menu. Pushing the

[F4 TBW] for 1 sec. you can step through the TX audio band pass. There are three levels of audio passband available

(Wide, Mid, and Nar). TX Audio Passband widths Wide Mid

: 2.9 kHz

: 2.6 kHz Nar

: 2.0 kHz

; Great Full Audio

; Great for operators with deep full voices

; Great for breaking through pile ups 4. Microphone Equalizer Although these bandwidths are xed, the Microphone Tone Control will give you more audio control for your Voice operation on SSB, AM, and FM modes. Your IC-746PRO is equipped with a very powerful equal-

izer system with 121 possible combinations. This is achieved by using the separate bass and treble ad-

justments. The default for both the Base and Treble is at 0 dB. Entering Microphone Tone Control set mode:

q Push [MENU] several time, or until M2 is shown on the display. w Push [F4 TCN] for the Tone Control set mode. e Push the appropriate mode switch to adjust SSB, AM, or FM. r Push [F1 ] or [F2 ] to change to the desired component. QUICK REFERENCE GUIDE A G C D U P C M P T B W S C P F 1 F 2 F 3 F 4 F 5 Push [F4]

T X B W = W I D E A G C D U P C M P T B W S C P F 1 F 2 F 3 F 4 F 5 The selected transmit filter width is displayed for approx. 1 sec. Push [F4] for 1 sec. to select the transmit filter width.

[F1 ]

[F2 ] [F4 TCN]

[MENU]

Tuning dial Hint!

Voice patterns and audio characteristics vary with each operator, therefore the [MIC GAIN], DSP TX Audio Pass Band and Microphone Tone Control settings will be different for each operator. Actual on air experimenting is necessary to get the just right sound. 1. TX Bass This item adjusts the bass level of the transmit audio tone from 5 dB to +5 dB in 1 dB steps. T X B a s s S S B 1 O 2. TX Treble This item adjusts the treble level of the transmit audio tone from 5 dB to +5 dB in 1 dB steps. T X T r e b l e S S B 2 O Verify you have selected a clear frequency and call out your CQ!

X 1 PANEL DESCRIPTION I Front panel

!4!5!6!7

!3 !2 i746PRO TUNER ANT NR NOTCH POWER TRANSMIT PHONES NR A/NOTCH ELEC-KEY AF RF/SQL MIC q w e r t HF/VHF TRANSCEIVER 1.8 1 3.5 2 7 3 10 4 14 5 18 6 F-INP 21 7 24 8 28 9 SPLIT GENE 50 0 144 ENT A/B MP-W TX XFC MP-R TS RX LOCK F 1 F 2 F 3 F 4 F 5 MENU SSB CW/RTTY AM/FM FILTER MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR CALL LOCK/

SPCH y u i o !0 !1 q POWER SWITCH [POWER]

Push momentarily to turn power ON. Turn the optional DC power supply ON in advance. Push for 1 sec. to turn power OFF. t MICROPHONE CONNECTOR [MIC]

Accepts the supplied or optional microphone. See p. 100 for appropriate microphones. See p. 12 for microphone connector information. w TRANSMIT SWITCH [TRANSMIT]

Selects transmitting or receiving. The [TX] indicator lights red while transmitting and the

[RX] indicator lights green when the squelch is open. e HEADPHONE JACK [PHONES]

Accepts headphones. Output power: 5 mW with an 8 load. When headphones are connected, the internal speaker or connected external speaker does not function. r ELECTRONIC KEYER JACK [ELEC-KEY] (p. 14) Accepts a paddle to activate the internal electronic keyer for CW operation. Selection between the internal electronic keyer, bug-key and straight key operation can be made in keyer set mode. (p. 34) A straight key jack is separately available on the rear panel. See [KEY] on p. 7. Keyer polarity (dot and dash) can be reversed in keyer set mode. (p. 34) 4-channel memory keyer is available for your conve-

nience. (p. 30)

(dot)

(com)

(dash) y RF GAIN CONTROL/SQUELCH CONTROL

[RF/SQL] (outer control) Adjusts the RF gain and squelch threshold level. The squelch removes noise output from the speaker

(closed condition) when no signal is received. The squelch is particularly effective for FM. It is also available for other modes. 12 to 1 oclock position is recommended for any setting of the [RF/SQL] control. The control can be set as Auto (RF gain control in SSB, CW and RTTY; squelch control in AM and FM) or squelch control (RF gain is fixed at maximum) in set mode as follows. (p. 81) MODE SSB, CW RTTY AM, FM SET MODE SETTING AUTO RF GAIN SQL SQL SQL SQL RF GAIN + SQL RF GAIN + SQL RF GAIN + SQL When setting as RF gain/squelch control Noise squelch (FM mode) Squelch is open. RF gain adjustable range Recommended level Maximum RF gain S-meter squelch 1 When functioning as RF gain control

(Squelch is xed open; SSB, CW, RTTY only) Maximum RF gain Adjustable range Minimum RF gain When functioning as squelch control

(RF gain is xed at maximum.) Noise squelch threshold

(FM mode) Squelch is open. Noise squelch (FM mode) S-meter squelch threshold S-meter squelch Shallow Deep While rotating the RF gain control, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction. u MIC GAIN CONTROL [MIC GAIN]

Adjusts microphone input gain. The transmit audio tone in SSB, AM and FM modes can be adjusted in tone control set mode. (p. 88)

How to set the microphone gain. Set the [MIC] control so that the ALC meter sometimes swings during normal voice transmission in SSB mode. Recommended level for an Icom microphone Decreases Increases MIC GAIN i AF CONTROL [AF] (inner control) Varies the audio output level from the speaker. AF RF/SQL Decreases Increases No audio output Max. audio output o RF POWER CONTROL [RF PWR]

Continuously varies the RF output power from min-

imum (less than 5 W*) to maximum (100 W*).

* AM mode: less than 5 W to 40 W Decreases Increases RF PWR PANEL DESCRIPTION 1

!0 CW PITCH CONTROL [CW PITCH] (p. 28) Shifts the received CW audio pitch and monitored CW audio pitch without changing the operating fre-

quency. The pitch can be changed from 300 to 900 Hz in approx. 25 Hz steps. Decreases Increases CW PITCH

!1 ELECTRONIC CW KEYER SPEED CONTROL

[KEY SPEED] (p. 28) Adjusts the internal electronic CW keyers speed. 6 wpm (min.) to 60 wpm (max.) can be set. Slow Fast KEY SPEED

!2 AUTO NOTCH/MANUAL NOTCH SWITCH

[A/NOTCH] (p. 53) Toggles the notch function between manual and au-

tomatic when pushed. NOTCH appears when manual; A NOTCH appears when automatic notch is selected.

!3 NOTCH CONTROL [NOTCH] (outer control; p. 53) Adjusts the notch lter frequency to remove a inter-

ference signal. NR NOTCH Low freuency High frequency

!4 ANTENNA SELECTOR SWITCH [ANT] (p. 75) Switches the antenna connector selection between ANT1 and ANT2 when pushed.

!5 NOISE REDUCTION LEVEL CONTROL [NR]

(inner control; p. 53) Adjusts the noise reduction level when the noise re-

duction is in use. Set for maximum readability. NR NOTCH Decreases Increases OFF

!6 ANTENNA TUNER SWITCH [TUNER] (pgs. 76, 77) Turns the antenna tuner ON and OFF (bypass) when pushed momentarily. Starts to tune the antenna manually when pushed for 1 sec. When the tuner cannot tune the antenna, the tuning circuit is bypassed automatically after 20 sec.

!7 NOISE REDUCTION SWITCH [NR] (p. 53) Switches the noise reduction ON and OFF. NR appears while the noise reduction is activated. 2 1 PANEL DESCRIPTION I Front panel (continued) i746PRO TUNER ANT NR NOTCH T NR A/NOTCH Y AF RF/SQL HF/VHF TRANSCEIVER TWIN PBT 1.8 1 3.5 2 7 3 10 4 14 5 18 6 F-INP 21 7 24 8 28 9 SPLIT GENE 50 0 144 ENT A/B MP-W TX XFC MP-R TS RX LOCK PBTC MW V/M M-CL M-CH RIT TX CLEAR RIT/TX

#7

#6

#5

#4

#3

#2

#1

#0 F 1 F 2 F 3 F 4 F 5 MENU SSB CW/RTTY AM/FM FILTER MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR CALL LOCK/

SPCH

!8

!9 @0 @1

@2 @3 @4

@6@5

@7

@8

@9

!8 MULTI-FUNCTION SWITCHES [F1][F5]

@1 PREAMP/ATTENUATOR SWITCH [P.AMP/ATT]

Push to select the function indicated in the LCD display above these switches. (p. 11) Functions vary depending on the operating condition. Push to input a character for memory keyer pro-

gramming or memory name. (pgs. 31, 66)

!9 MENU SWITCH [MENU]

Push to change the set of functions assigned to the multi-function switches. Toggles between menu 1 (M1) and menu 2 (M2).

@0 MODE SWITCHES Selects the desired mode. (p. 23) Announces the selected mode when an optional UT-102 is installed. (p. 89) SSB CW/RTTY Selects USB and LSB mode alternately. Selects SSB data mode (USB-D, LSB-D) when pushed for 1 sec. in SSB mode. Selects CW and RTTY mode alternately. Switches CW and CW-R (CW reverse) mode when pushed for 1 sec. in CW mode. Switches RTTY and RTTY-R (RTTY re-

verse) mode when pushed for 1 sec. in RTTY mode. AM/FM Selects AM and FM mode alternately. Selects AM/FM data mode (AM-D, FM-D) when pushed for 1 sec. AM/FM mode.

(p. 48) Push momentarily to toggle between preamp-1 and preamp-2. P.AMP1 activates for HF all bands. P.AMP2 activates high-gain preamp for 24 MHz band and above. Push for 1 sec. to toggle the attenuator function ON and OFF.

What is the preamp?

The preamp amplies received signals in the front end cir-

cuit to improve the S/N ratio and sensitivity. Select P.AMP1 or P.AMP2 when receiving weak signals.

What is the attenuator?

The attenuator prevents a desired signal from distorting when very strong signals are near the desired frequency, or when very strong electric elds, such as from a broadcast-

ing station, are near your location.

@2 NOISE BLANKER SWITCH [NB] (p. 51) Switches the noise blanker ON and OFF when pushed. The noise blanker reduces pulse-type noise such as that generated by automobile igni-

tion systems. This function cannot be used for FM, or non-pulse-type noise. NB appears while the noise blanker is activated. Enters the noise blanker level set mode when pushed for 1 sec. 3 PANEL DESCRIPTION 1

@3 VOX/BREAK-IN SWITCH [VOX/BK-IN]

#0 RIT SWITCH [RIT] (p. 48) In SSB, AM and FM modes, push momentarily to turn the VOX function ON and OFF (p. 54); push for 1 sec. to enter VOX set mode (p. 54). In CW mode, push momentarily to turn the semi break-in, full break-in or break-in OFF (p. 56);

push for 1 sec. to enter break-in set mode (p. 56).

What is the VOX function?

The VOX function (voice operated transmission) starts trans-

mission without pushing the transmit switch or PTT switch when you speak into the microphone; then, automatically re-

turns to receive when you stop speaking.

What is the break-in function?

The break-in function switches transmit and receive with CW keying. Full break-in (QSK) can monitor the receive signal during keying.

@4 MONITOR SWITCH [MONITOR] (p. 57) Monitors your transmitted signal. Enters to monitor set mode when pushed for 1 sec.

@5 FILTER SWITCH [FILTER] (p. 50) Selects one of 3 IF lter settings. Enters the lter set mode when pushed for 1 sec.

@6 CALL SWITCH [CALL] (p. 64) Selects the call channel when pushed momentarily.

@7 TUNING DIAL (p. 21) Changes the displayed frequency, selects set mode items, etc.

@8 LOCK/SPEECH SWITCH [LOCK/SPCH]

Push momentarily to toggle the dial lock function ON and OFF. (p. 53) Pushing for 1 sec. announces the selected read-

out frequency and S-meter indication when an optional UT-102 is installed. (p. 89)

@9 RIT/TX CONTROL [RIT/TX] (pgs. 48, 56) Shifts the receive and/or transmit frequency without changing the transmit and/or receive frequency while the RIT and/or TX functions are ON. Rotate the control clockwise to increase the frequency, or rotate the control counterclockwise to decrease the frequency. The shift frequency range is 9.99 kHz in 10 Hz steps

(or 9.999 kHz in 1 Hz steps). RIT/TX Low shift High shift Turns the RIT function ON and OFF when pushed. Use the [RIT/TX] control to vary the RIT frequency. Adds the RIT shift frequency to the operating fre-

quency when pushed for 1 sec.

What is the RIT function?

The RIT (Receiver Incremental Tuning) shifts the receive fre-

quency without shifting the transmit frequency. This is useful for ne tuning stations calling you on an off-fre-

quency or when you prefer to listen to slightly different-

sounding voice characteristics, etc.

#1 CLEAR SWITCH [CLEAR] (pgs. 48, 56) Clears the RIT/TX shift frequency when pushed for 1 sec.

#2 TX SWITCH [TX] (p. 57) Turns the TX function ON and OFF when pushed. Use the [RIT/TX] control to vary the TX frequency. Adds the TX shift frequency to the operating frequency when pushed for 1 sec.

What is the TX function?

The TX shifts the transmit frequency without shifting the re-

ceive frequency. This is useful for simple split frequency op-

eration in CW, etc.

#3 MEMORY CHANNEL SELECTOR [M-CH] (p. 62) Select a memory channel. Rotate clockwise to increase the memory channel; ro-

tate counterclockwise to decrease the memory channel.

#4 VFO/MEMORY SWITCH [VFO/MEMO]

Switches the selected readout operating mode between the VFO mode and memory mode when pushed. (pgs. 20, 61) Transfers the memory contents to VFO when pushed for 1 sec. (p. 65)

#5 MEMORY CLEAR SWITCH [M-CL] (p. 62) Clears the selected readout memory channel con-

tents when pushed for 1 sec. in memory mode. The channel becomes a blank channel. This switch does not function in VFO mode.

#6 MEMORY WRITE SWITCH [MW] (p. 63) Stores the selected readout frequency and operat-

ing mode into the displayed memory channel when pushed for 1 sec. This function is available both in VFO and memory modes.

#7 PBT CLEAR SWITCH [PBTC] (p. 52) Clears the PBT settings when pushed for 1 sec. 4 1 PANEL DESCRIPTION I Front panel (continued) i746PRO NER ANT NR NOTCH NR A/NOTCH AF RF/SQL

%2

%1

%0 $9 $8 HF/VHF TRANSCEIVER TWIN PBT 1.8 1 3.5 2 7 3 10 4 14 5 18 6 F-INP 21 7 24 8 28 9 SPLIT GENE 50 0 144 ENT A/B MP-W TX XFC MP-R TS RX LOCK PBTC MW V/M M-CL M-CH RIT TX CLEAR RIT/TX

$7

$6

$5

$4

$3

$2

$1

$0

#9

#8 F 1 F 2 F 3 F 4 F 5 MENU SSB CW/RTTY AM/FM FILTER MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR CALL LOCK/

SPCH

#8 TRANSMIT FREQUENCY CHECK SWITCH [XFC]

$4 QUICK TUNING SWITCH [TS] (p. 21) Turns the quick tuning step ON and OFF. While the quick tuning indicator is displayed, the fre-

quency can be changed in programmed kHz steps. 0.1, 1, 5, 9, 10, 12.5, 20 and 25 kHz quick tuning steps are available. Quick tuning indicator While the quick tuning step is OFF, turns the 1 Hz step ON and OFF when pushed for 1 sec. 1 Hz indication appears in and the frequency can be changed in 1 Hz steps. While the quick tuning step is ON, enters the quick tuning step set mode when pushed for 1 sec.

$5 VFO SELECT SWITCH [A/B] (p. 20) Push to toggle between VFO A and VFO B. Push for 1 sec. to equalize the frequency and op-

erating mode of the two VFOs.

(pgs. 45, 48) Monitors the transmit frequency when pushed and held. While pushing this switch, the transmit frequency can be changed with the tuning dial, keypad or memo pad. When the split lock function is turned ON, pushing [XFC]

cancels the dial lock function. (p. 60)

#9 MEMO PAD-WRITE SWITCH [MP-W] (p. 67) Programs the selected readout frequency and op-

erating mode into a memo pad. The 5 most recent entries remain in memo pads. The transmit frequency is programmed when pushed to-

gether with [XFC]. The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience. (p. 84)

$0 TRANSMIT INDICATOR [TX]

Lights red while transmitting.

$1 MEMO PAD-READ SWITCH [MP-R] (p. 67) Each push calls up a frequency and operating mode in a memo pad. The 5 (or 10) most recently programmed frequencies and operating modes can be recalled, starting from the most recent. The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience. (p. 84)

$2 RECEIVE INDICATOR [RX]

Lights green while receiving a signal and when the squelch is open.

$3 LOCK INDICATOR [LOCK] (p. 53) Lights when the dial lock function is activated. 5

$6 SPLIT SWITCH [SPLIT]

Turns the split function ON and OFF when pushed.(p. 59) Turns the quick split function ON, when pushed for 1 sec. (p. 60) The offset frequency is shifted from the displayed fre-

quency. The quick split function can be turned OFF using set mode. (p. 82) Turns the split function ON and sets the transmit frequency after inputting an offset frequency with the keypad (4 MHz in 1 kHz steps; p. 59).

$7 PASSBAND TUNING CONTROLS [TWIN PBT]

Adjust the receivers passband width of the DSP lter. (p. 52) Passband width and shift frequency are displayed in the multi-function switch indicator. Push [PBTC] for 1 sec. to clear the settings when not in use. Variable range is set to half of the IF filter passband width. 25 Hz steps and 50 Hz steps are available. These controls function as an IF shift control while in AM mode and when the RTTY lter is turned ON. Only the inner control may function in this case.

What is the PBT control?

General PBT function electronically narrows the IF passband width to reject interference. This transceiver uses the DSP circuit for the PBT function. TWIN PBT PBT1 PBT2 TWIN PBT TWIN PBT TWIN PBT

+

Low cut Center High cut

$8 SPLIT INDICATOR (p. 59) Lights during split operation.

$9 FREQUENCY INPUT SWITCH [F-INP] (p. 22) Push to toggle keypad input between frequency and band. The frequency input indicator lights during fre-

quency input is selected for the keypad.

%0 FREQUENCY INPUT INDICATOR (p. 22) Lights during frequency input from the keypad is enable. PANEL DESCRIPTION 1

%1 KEYPAD Pushing a key selects the operating band.

[GENE] selects the general coverage band. Pushing the same key 2 or 3 times calls up other stacked frequencies in the band. (p. 19) Icoms triple band stacking register memorizes 3 fre-

quencies in each band. After pushing [F-INP], enters a keyed frequency. Pushing [144 ENT] is necessary at the end.

(p. 22) e.g. to enter 14.195 MHz, push [F-INP] [1] [4] [] [1]

[9] [5] [144 ENT].

%2 LCD FUNCTION DISPLAY

(See pgs. 9, 10 for details.) Shows the operating frequency, function switch menus, band scope screen, memory name screen, set mode settings, etc. 6 1 PANEL DESCRIPTION I Rear panel q w e r

!5

!4

!3

!2

!1

!0 o i u y t q DC POWER SOCKET [DC 13.8V] (pgs. 14, 16) o ALC INPUT JACK [ALC] (p. 17) Accepts 13.8 V DC through the supplied DC power cable (OPC-025D). Connects to the ALC output jack of a non-Icom lin-

ear amplier. Rear panel view w ANTENNA CONNECTOR [ANT 144MHz]

e ANTENNA CONNECTOR 2 [ANT2]

r ANTENNA CONNECTOR 1 [ANT1]

(pgs. 14, 15, 17, 74) Accept a 50 antenna with a PL-259 connector.

[ANT 144MHz] for 144 MHz band only; [ANT1]

When using an optional AH-4 HF/50 MHz AUTO-

MATIC ANTENNA TUNER, connect it to the [ANT1]

connector. The internal antenna tuner activates for

[ANT2] and deactivates for [ANT1] when connecting the AH-4.

!0 ACCESSORY SOCKET 2 [ACC(2)]

!1 ACCESSORY SOCKET 1 [ACC(1)]

Enable connection of external equipment such as a linear amplifier, an automatic antenna selector/

tuner, TNC for data communications, etc. See p. 8 for socket information.

!2 STRAIGHT KEY JACK [KEY] (p. 14) Accepts a straight key or external electronic keyer with 14 inch standard plug.

[ELEC-KEY] on the front panel can be used for a straight key or external electronic keyer. Deactivate the internal electronic keyer in keyer set mode. (p. 34)

(+)

(_) t DATA SOCKET [DATA] (pgs. 15, 77) Connects a TNC (Terminal Node Controller), etc. for data communications. See p. 8 for connector information.

!3 TUNER CONTROL SOCKET [TUNER]

(pgs. 15, 76) Accepts the control cable from an optional AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER. y EXTERNAL SPEAKER JACK [EXT SP]

(pgs. 15, 100) Accepts a 48 speaker. u CI-V REMOTE CONTROL JACK [REMOTE] (p. 94) Designed for use with a personal computer for re-

mote control of transceiver functions. Used for transceive operation with another Icom CI-V transceiver or receiver. i SEND CONTROL JACK [SEND] (p. 17) Goes to ground while transmitting to control exter-

nal equipment such as a linear amplier. Max. control level: 16 V DC/0.5 A 7 If you use an external electronic keyer, make sure the voltage retained by the keyer is less than 0.4 V when the key is ON.

!4 CALIBRATION POT [CAL] (p. 93) This is used for frequency calibration. The transceiver has been adjusted and calibrated thor-

oughly at the factory. Under normal circumstances, the frequency does not need to be re-calibrated.

!5 GROUND TERMINAL [GND] (pgs. 13, 14) Connect this terminal to a ground to prevent electri-

cal shocks, TVI, BCI and other problems. PANEL DESCRIPTION 1 D DATA SOCKET DATA PIN No. NAME DESCRIPTION 1 2 3 4 5 6 1 2 3 5 4 6 Rear panel view D ACC SOCKETS DATA IN Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK) GND Common ground for DATA IN, DATA OUT and AF OUT. PTT P PTT terminal for packet operation. Connect ground to transmit data. DATA OUT Data out terminal for 9600 bps operation only. AF OUT Data out terminal for 1200 bps operation only. P SQL Squelch out terminal. Becomes high (+8 V) when the transceiver receives a signal which opens the squelch. To avoid unnecessary TNC transmission, connect squelch to the TNC to inhibit trans-

mission when receiving signals. Keep audio output at a normal level, otherwise a P SQL signal will not be output. ACC (1) PIN No. NAME DESCRIPTION SPECIFICATIONS 2 8 4 1 6 5 7 3 Rear panel view 1 2 3 4 5 6 7 8 RTTY Controls RTTY keying High level Low level Output current

: More than 2.4 V

: Less than 0.6 V

: Less than 2 mA GND Connects to ground. Connected in parallel with ACC(2) pin 2. Input/output pin. (HF/50 MHz only) Ground level HSEND Goes to ground when transmitting. Output current When grounded, transmits.

: 0.5 V to 0.8 V

: Less than 20 mA

: Less than 200 mA Input current (Tx) Connected in parallel with ACC(2) pin 3. MOD Modulator input. Connects to a modulator. Input impedance Input level

: 10 k

: Approx. 100 mV rms AF AF detector output. Fixed, regardless of [AF] position in Output level default settings. (see notes below) Output impedance : 4.7 k SQLS Squelch output. Goes to ground when squelch opens. SQL closed SQL open

: 100300 mV rms

: Less than 0.3 V/5 mA

: More than 6.0 V/100 A 13.8 V 13.8 V output when power is ON. ALC ALC voltage input. Output current Connected in parallel with ACC(2) pin 7.

: Max. 1 A Control voltage Input impedance Connected in parallel with ACC(2) pin 5.

: 4 V to 0 V

: More than 10 k ACC (2) PIN No. NAME DESCRIPTION SPECIFICATIONS 2 4 1 6 5 7 3 Rear panel view 1 2 3 4 5 6 7 8 V Regulated 8 V output. GND HSEND BAND Band voltage output.

(Varies with amateur band) Output voltage Output current

: 8 V 0.3 V

: Less than 10 mA Same as ACC(1) pin 2. Same as ACC(1) pin 3. Output voltage

: 0 to 8.0 V ALC Same as ACC (1) pin 8. Input/output pin (144 MHz only) Ground level VSEND Goes to ground when transmitting. Output current When grounded, transmits. Input current (Tx)

: 0.5 V to +0.8 V

: Less than 20 mA

: Less than 200 mA 13.8 V Same as ACC(1) pin 7. 8 1 PANEL DESCRIPTION I LCD display

!4

!3

!2

!1 q w e r t

!0 o i u y

!0 14 TUNING DIAL SPEED INDICATOR (p. 21) Appears when the tuning dial speed is set so that one rotation is equal to 14 of the normal rotation.

!1 VOICE SQUELCH CONTROL INDICATOR (p. 54) Appears during VSC (Voice Squelch Control) func-

tion is activated.

!2 MODE INDICATORs (p. 23) Shows the selected operating mode. D appears when SSB data, AM data or FM data mode is selected.

!3 ANTENNA INDICATOR (p. 75) Indicate which antenna connector is use for HF/50 MHz.

!4 ANTENNA TUNER INDICATORS (pgs. 75, 76) TUNE appears when the antenna tuner is ON;

TUNE appears and ashes during manual tun-

ing. EXT appears when the optional AH-4 external antenna tuner is connected to [ANT1]. q FREQUENCY READOUTS Show the operating frequency. w MULTI-FUNCTION METER INDICATION Shows receiving signal strength, etc. during re-

ceive. Shows transmit output power, ALC and SWR dur-

ing transmit. e VOX INDICATOR (p. 54) Appears when the VOX function is activated. r MICROPHONE COMPRESSOR INDICATOR (p. 58) Appears when the microphone compressor is acti-

vated. t MULTI-FUNCTION SWITCH INDICATOR (p. 11) Indicates the functions assigned to the multi-func-

tion switches ([F1][F5]). y DSP FILTER INDICATOR (p. 50) Shows the selected IF lter. u MEMORY CHANNEL READOUTS (p. 62) Show the selected memory channel. i SELECT MEMORY CHANNEL INDICATOR (p. 72) Appears when the selected memory channel is set as a select memory channel. o BLANK MEMORY INDICATOR (p. 62) Appears when the selected memory channel is blank. 9 I LCD display (continue)

@9 PANEL DESCRIPTION 1

!5

!6

!7

!8

!9

@0

@8

@7

@6

@5

@4

@3

@2

@1

!5 BREAK-IN INDICATORS (p. 56)

@4 NOISE REDUCTION INDICATOR (p. 53) FBK-IN appears when the full break-in function Appears when the noise reduction is activated. is activated. BK-IN appears when the semi break-in function is activated.

@5 NOTCH INDICATORS (p. 53) NOTCH appears when the manual notch func-

tion is activated.

!6 MONITOR INDICATORS (p. 57) ANOTCH appears when the automatic notch Appears when the monitor function is activated. function is activated.

!7 PREAMP INDICATORS (p. 48) Appears when the preamp is activated.

!8 ATTENUATOR INDICATORS (p. 48) Appears when the attenuator is activated.

@6 SPLIT INDICATOR (pgs. 58, 59) Appears during split operation.

@7 MEMORY INDICATOR (p. 62) Appears during memory mode.

@8 VFO INDICATORS (p. 20) Indicates whether VFO A or VFO B is selected.

@9 RIT/TX INDICATORS (pgs. 48, 56) Appears during RIT or TX operation and indicate the frequency offset.

!9 AGC INDICATORS (p. 49) Shows the selected AGC time constant. F for AGC fast; M for AGC middle; S for AGC slow; -OFF for AGC OFF.

@0 NOISE BLANKER INDICATOR (p. 51) Appears when the noise blanker is activated.

@1 DTCS INDICATOR (p. 43) Appears during DTCS operation.

@2 TONE SQUELCH INDICATORS T appears when the repeater tone is activated.

(p. 44) TSQL appears during tone squelch operation.

(p. 42)

@3 DUPLEX INDICATOR (p. 44) DUP or DUP+ appears during repeater opera-

tion. 10 1 PANEL DESCRIPTION I Multi function switches DM1 FUNCTIONS During SSB operation AGC F 1 DUP F 2 CMP F 3 TBW F 4 SCP F 5 During SSB data operation AGC F 1 DUP F 2 1/4 F 3 SCP F 5 F 4 During CW operation AGC F 1 DUP F 2 1/4 F 3 KEY F 4 SCP F 5 During RTTYoperation AGC F 1 DUP F 2 1/4 F 3 RTY F 4 SCP F 5 During AM operation AGC F 1 DUP F 2 CMP F 3 SCP F 5 F 4 During FM operation AGC F 1 DUP F 2 CMP F 3 TON F 4 SCP F 5 AGC (p. 49) AGC F 1 Push momentarily to changes the time constant of the AGC circuit. Push for 1 sec. to enter to the AGC set mode. DUPLEX (p. 44) DUP F 2 Push momentarily to selects the duplex direction or turn the function OFF. DUP or DUP+ indicator appears during duplex operation. Push for 1 sec. to turn the one-touch re-

peater function ON/OFF. SPEECH COMPRESSOR (p. 58) CMP F 3 Push momentarily to turn the speech compressor function ON/OFF. COMP indicator appears when the speech compressor is ON. Push for 1 sec. to enter to the compres-

sor set mode. 11 14 FUNCTION (p. 21) 1/4 F 3 Push to turn the 14 function ON/OFF. ON. indicator appears when the 14 function is TRANSMISSION BANDWIDTH (p. 58) TBW F 4 Push to select the transmission bandwidth. Bandwidth is selectable from narrow, middle and wide. MEMORY KEYER MENU (p. 29) KEY F 4 Push to select the memory keyer or keyer send menu, depending on the KEYER 1st Menu setting in the set mode (p. 86). RTTY MENU (p. 36) Push to select the RTTY menu. RTY F 4 BAND SCOPE FUNCTION (p. 47) Push to select the band scope screen. SCP F 5 DM2 FUNCTIONS SCN F 1 MEM F 2 SWR F 3 TCN F 4 VSC F 5 SCAN MENU (p. 70) Push to select the scan menu. SCN F 1 MEMORY NAME MENU (p. 67) Push to select the memory name screen. MEM F 2 SWR GRAPH FUNCTION (p. 61) Push to indicates the SWR graph screen. SWR F 3 TONE CONTROL SET MODE (p. 88) Push to enter the audio tone set mode. TCN F 4 VSC FUNCTION (p. 54) VSC F 5 Push to turns the VSC (Voice Squelch Control) function ON and OFF. PANEL DESCRIPTION 1 I Microphone (HM-36) q w q UP/DOWN SWITCHES [UP]/[DN]

w PTT SWITCH Change the selected readout frequency or memory channel. Continuous pushing changes the frequency or memory channel number continuously. While pushing [XFC], the transmit readout frequency can be controlled while in spilt frequency operation. The [UP]/[DN] switch can simulate a key paddle. Preset in the keyer set mode. (p. 34) MICROPHONE CONNECTOR

(Front panel view) i Main readout AF output

(varies with [AF]/[BAL]) q Microphone input w +8 V DC output u GND

(Microphone ground) y GND (PTT ground) e Frequency up/down t PTT r Main readout squelch switch Push and hold to transmit; release to receive.

[MIC]

Pin No. FUNCTION DESCRIPTION w e r

+8 V DC output Frequency up Frequency down Squelch open Squelch closed Max. 10 mA Ground Ground through 470 Low level High level CAUTION: DO NOT short pin 2 to ground as this can damage the internal 8 V regulator. NOTE: DC voltage is applied to pin 1 for micro-

phone operation. Take care when using a non-Icom microphone. HM-36 SCHEMATIC DIAGRAM MICROPHONE MICROPHONE CABLE MICROPHONE PLUG

+

10 2k 4700p

+

0.33 4700p MIC ELEMENT DOWN UP PTT RECEIVE TRANSMIT 470 q u w i y e r t 12 2 INSTALLATION AND CONNECTIONS I Unpacking After unpacking, immediately report any damage to the delivering carrier or dealer. Keep the shipping cartons. For a description and a diagram of accessory equip-

ment included with the IC-746PRO, see Supplied ac-

cessories on p. ii of this manual. I Selecting a location Select a location for the transceiver that allows ade-

quate air circulation, free from extreme heat, cold, or vibrations, and away from TV sets, TV antenna ele-

ments, radios and other electro magnetic sources. The base of the transceiver has an adjustable stand for desktop use. Set the stand to one of two angles de-

pending on your operating conditions. I Grounding To prevent electrical shock, television interference

(TVI), broadcast interference (BCI) and other prob-

lems, ground the transceiver through the GROUND terminal on the rear panel. For best results, connect a heavy gauge wire or strap to a long earth-sunk copper rod. Make the distance be-

tween the [GND] terminal and ground as short as pos-

sible. R WARNING: NEVER connect the [GND]

terminal to a gas or electric pipe, since the connec-

tion could cause an explosion or electric shock. I Antenna connection For radio communications, the antenna is of critical im-

portance, along with output power and sensitivity. Se-

lect antenna(s), such as a well-matched 50 antenna, and feedline. 1.5:1 or better of Voltage Standing Wave Ratio (VSWR) is recommended for your desired band. Of course, the transmission line should be a coaxial cable. When using 1 antenna, use the [ANT1] connector. CAUTION: Protect your transceiver from lightning by using a lightning arrestor. PL-259 CONNECTOR INSTALLATION EXAMPLE 30 mm Coupling ring 10 mm (soft solder) 10 mm Soft solder 12 mm solder solder q w e r Slide the coupling ring down. Strip the cable jacket and soft solder. Strip the cable as shown at left. Soft sol-

der the center con-

ductor. Slide the connector body on and solder it. Screw the coupling ring the connector body. onto 30 mm 98 in 10 mm 38 in 12 mm 116 in Antenna SWR Each antenna is tuned for a specified frequency range and SWR may be increased out-of-range. When the SWR is higher than approx. 2.0:1, the transceivers power drops to protect the nal transis-

tor. In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting even when using the antenna tuner. The IC-746PRO has an SWR meter to moni-

tor the antenna SWR continuously. 13 INSTALLATION AND CONNECTIONS 2 I Required connections Front panel CW KEY

(dot)

(com)

(dash) i746PRO TUNER ANT NR NOTCH POWER TRANSMIT PHONES NR A/NOTCH ELEC-KEY AF RF/SQL MIC HF/VHF TRANSCEIVER TWIN PBT 1.8 1 3.5 2 7 3 10 4 14 5 18 6 F-INP 21 7 24 8 28 9 SPLIT GENE 50 0 144 ENT A/B MP-W MP-R TS XFC PBTC MW V/M M-CL M-CH RIT TX CLEAR RIT/TX F 1 F 2 F 3 F 4 F 5 MENU SSB CW/RTTY AM/FM FILTER MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR CALL LOCK/

SPCH A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p.34) MICROPHONES (p. 100) HM-36 SM-20

(optional) Rear panel 144 MHz ANTENNA (pgs. 13, 74) ANTENNA 1, 2 (pgs. 13, 74)

[Example]: ANT1 for 1.818 MHz bands ANT2 for 2150 MHz bands Connect a VHF

(60144 MHz) antenna;

impedance: 50 . DC POWER SUPPLY PS-125

(Optional) GROUND (p. 13) STRAIGHT KEY Use the heaviest gauge wire or strap available and make the connection as short as possible. Grounding prevents electrical shocks, TVI and other problems.

(+)

(_) 14 2 INSTALLATION AND CONNECTIONS I Advanced connections Front panel HEADPHONES i746PRO TUNER ANT NR NOTCH POWER TRANSMIT PHONES NR A/NOTCH ELEC-KEY AF RF/SQL MIC HF/VHF TRANSCEIVER TWIN PBT 1.8 1 3.5 2 7 3 10 4 14 5 18 6 F-INP 21 7 24 8 28 9 SPLIT GENE 50 0 144 ENT A/B MP-W TX XFC MP-R TS RX LOCK PBTC MW V/M M-CL M-CH RIT TX CLEAR RIT/TX F 1 F 2 F 3 F 4 F 5 MENU SSB CW/RTTY AM/FM FILTER MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR CALL LOCK/

SPCH MIC The AFSK modulation signal can be input from [MIC]. (p. 77) Rear panel AH-2b AH-4 (p. 76) ANTENNA 1, 2 (p. 17) Connects a linear amplifier, antenna selector, etc. When using the AH-4, it must be connected to the [ANT1]

connector.

[SEND], [ALC] (p. 17) Used for connecting a non-Icom linear ampli-

fier.

[DATA] (p. 77) EXTERNAL SPEAKER (p. 100) SP-21 ACC SOCKETS (pgs. 8, 77)

[REMOTE] (p. 94) Used for computer control and transceive operation. 15 I Power supply connections Use an optional DC power supply with a 25 A capacity and above when operating the transceiver with AC power. Refer to the diagrams below. INSTALLATION AND CONNECTIONS 2 CAUTION: Before connecting the DC power cable, check the following important items. Make sure:

The [POWER] switch is OFF. Output voltage of the power source is 1215 V when you use a non-Icom power supply. DC power cable polarity is correct. Red Black

: positive + terminal

: negative _ terminal CONNECTING PS-125 DC POWER SUPPLY PS-125 Transceiver Connect to an AC outlet using the supplied AC cable. DC power socket DC power cable CONNECTING A DC POWER SUPPLY AC outlet A DC power supply Transceiver 13.8 V; at least 23 A Black _ Red

+

to DC power socket Supplied DC power cable AC cable 30 A fuses CONNECTING A VEHICLE BATTERY Grommet NEVER connect to a 24 V battery. NOTE: Use terminals for the cable connections. _ black

+ red Crimp 12 V battery Supplied DC power cable Solder NEVER connect to a battery without supplied DC fuses, otherwise a re hazard may occur. 16 2 INSTALLATION AND CONNECTIONS I Linear amplier connections CONNECTING THE IC-PW1 Use the [ANT1] connector when connecting a linear amplier. To an antenna ACC(1) Remote control cable (supplied with the IC-PW1) ACC cable (supplied with the IC-PW1) ANT REMOTE INPUT1 Coaxial cable

(supplied with the IC-PW1) Be sure to connect the cable to the 7-pin ACC(2) jack. EXCITER 1 1&2 GND GND E T O M E R ANT1 ACC(2) IC-PW1 AC outlet

(Non-European versions: 100120/220240 V European version

: 230 V) Ground Transceiver Turn OFF the transceivers antenna tuner while tuning the IC-PW1s tuner. CONNECTING A NON-ICOM LINEAR AMPLIFIER To an antenna RF OUTPUT RF INPUT ALC SEND 50 coaxial cable ANT1 Transceiver Non-Icom linear amplifier ALC SEND R WARNING:

Set the transceiver output power and linear amplier ALC output level referring to the linear amplier instruction manual. The ALC input level must be in the range 0 V to 4 V, and the transceiver does not accept pos-

itive voltage. Non-matched ALC and RF power settings could cause a fire or ruin the linear amplier. The specifications for the SEND relay are 16 V/DC 0.5 A. If this level is exceeded, a large external relay must be used. I External antenna tuner connection CONNECTING THE AH-4 The AH-4 must be connected to [ANT1]. Coaxial cable (from AH-4) Transceiver ANT1 17 Control cable Ground AH-4 Long wire or optional AH-2b BASIC OPERATION 3 I When rst applying power (CPU resetting) Before rst applying power, make sure all connections required for your system are complete by referring to Chapter 2. Then, reset the transceiver using the fol-

lowing procedure. NOTE: When rst applying power or when operat-

ing in cold environments, the display may icker or appear faint. This is normal and will disappear once the transceiver has warmed up. q Make sure the transceiver power is OFF. w While pushing [M-CL] and [F-INP], push [POWER]

for 1 sec. to turn power ON. The internal CPU is reset. The transceiver displays its initial VFO frequency when resetting is complete. e Correct the set mode settings after resetting, if de-

sired. Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values. I Initial settings After resetting the transceiver, set controls and switches as shown in the gure below.

[POWER]

[F-INP] [M-CL]

CW CCW : Counterclockwise

: Clockwise

[NR]: Max. CCW

[NOTCH]: Max. CCW

[TRANSMIT]: OFF i746PRO TUNER ANT NR NOTCH POWER TRANSMIT PHONES NR A/NOTCH ELEC-KEY AF RF/SQL

[AF]: Max. CCW MIC

[RF/SQL]: 12 oclock

[MIC GAIN]: Max. CCW HF/VHF TRANSCEIVER TWIN PBT 1.8 1 3.5 2 7 3 10 4 14 5 18 6 F-INP 21 7 24 8 28 9 SPLIT GENE 50 0 144 ENT A/B MP-W TX XFC MP-R TS RX LOCK PBTC MW V/M M-CL M-CH RIT TX CLEAR RIT/TX F 1 F 2 F 3 F 4 F 5 MENU SSB CW/RTTY AM/FM FILTER MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR CALL LOCK/

SPCH

[RF PWR]: Max. CCW

[CW PITCH]: 12 oclock

[KEY SPEED]: Max. CCW 18 3 BASIC OPERATION I Selecting an operating band The transceiver has a triple band stacking register. This means that the last 3 operating frequencies and modes used on a particular band are automatically memorized. See the table below for a list of the bands available and the default settings for each register. Band keys BAND 1.8 MHz 3.5 MHz 7 MHz 10 MHz 14 MHz 18 MHz 21 MHz 24 MHz 28 MHz 50 MHz 144 MHz General REGISTER 1 1.900000 MHz CW 3.550000 MHz LSB 7.050000 MHz LSB 10.120000 MHz CW 14.100000 MHz USB 18.100000 MHz USB 21.200000 MHz USB 24.950000 MHz USB 28.500000 MHz USB 50.100000 MHz USB 145.000000 MHz FM 15.000000 MHz USB REGISTER 2 1.910000 MHz CW 3.560000 MHz LSB 7.060000 MHz LSB 10.130000 MHz CW 14.200000 MHz USB 18.130000 MHz USB 21.300000 MHz USB 24.980000 MHz USB 29.500000 MHz USB 50.200000 MHz USB 145.100000 MHz FM 15.100000 MHz USB REGISTER 3 1.915000 MHz CW 3.580000 MHz LSB 7.020000 MHz CW 10.140000 MHz CW 14.050000 MHz CW 18.150000 MHz USB 21.050000 MHz CW 24.900000 MHz CW 28.100000 MHz CW 51.000000 MHz FM 145.200000 MHz FM 15.200000 MHz USB D Using the band stacking registers q Push [14 5], then select a frequency and an operat-

ing mode. Frequency and operating mode are memorized in the rst band stacking register. w Push [14 5] again, then select another frequency and operating mode. This frequency and operating mode are memorized in the second band stacking register. e Push [14 5] again, then select another frequency and operating mode. This frequency and operating mode are memorized in the third band stacking register. When a fourth frequency and operating mode are se-

lected on a band, the rst register. set in step q, is over-

written.

[Example]: 14 MHz band 1.8 1 3.5 2 7 3 10 4 14 5 18 6 21 7 24 8 28 9 GENE 50 0 144 ENT 19 I Selecting VFO/memory mode VFO is an abbreviation of Variable Frequency Oscilla-

tor, and traditionally refers to an oscillator. Push [V/M] to switch between VFO and memory modes. Pushing [V/M] for 1 sec. transfers the contents of the se-

lected memory channel to VFO mode (p. 65). I VFO operation The transceiver has 2 VFOs and are called VFO A and VFO B. You can use the desired VFO to call up a fre-

quency and operating mode for your operation. DSelecting the VFO A/B Push [A/B] to switch between the VFO A and VFO B. VFO A or VFO B appears. BASIC OPERATION 3

[V/M]

[A/B]

Either one is appears DVFO equalization Push [A/B] for 1 sec. to equalize the undisplayed VFO condition to the displayed VFO. 3 beeps sound when the VFO equalization is completed. CONVENIENT Use two VFOs as a quick memory When you find a new station, but you wish to continue searching, the Two VFO system can be used for quick mem-

ory storage. q Push [A/B] for 1 sec. to store the displayed frequency into the undisplayed VFO. w Continue to searching for stations. e Push [A/B] to retrieve the stored frequency. r To continue searching for station, push [A/B] again. Push for 1 sec. A/B 20 3 BASIC OPERATION I Frequency setting The transceiver has several tuning methods for conve-

nient frequency tuning. DTuning with the tuning dial q Push the desired band key on the keypad 13 times. 3 different frequencies can be selected on each band with the band key. (p. 19) w Rotate the tuning dial to set the desired frequency. If the dial lock function is activated, the lock indicator lights, and the tuning dial does not function. In this case, push [LOCK/SPCH] to deactivate the lock function. (see p. 53 for details) DQuick tuning step The operating frequency can be changed in kHz steps

(0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for quick tuning. q Push [SSB], [CW/RTTY] or [AM/FM] to select the desired operation mode. w Push [TS] momentarily to activate the quick tuning function. M appears. e Push [TS] for 1 sec. to enter the tuning step set mode. r Rotate the tuning dial to select the desired tuning step. t Push [TS] to exit the tuning step set mode. D 14 Tuning step function (SSB data, CW and RTTY only) While operating in SSB data/CW/RTTY, the 14 function is available for critical tuning. Dial rotation is reduced to 14 of normal when the 14 function is in use. While M1 is selected with [MENU], push [F3 1/4]

to toggle the 14 function ON and OFF. Band keys Tuning dial Select mode

[TS]

S S B 1 k H z 14 indicator D I A L A u t o T S 2 7 H I G H D Auto tuning step function When rotating the tuning dial rapidly, the tuning step automatically changes several times as selected. q Push [MENU] for 1 sec. to enter the set mode. w Push [F1] or [F2 ] to select the DIAL Auto TS item. e Rotate the tuning dial to select the function ON

(HIGH or LOW) and OFF. HIGH : Approx. 5 times faster LOW : Approx. 2 times faster OFF : Auto tuning step is turned OFF. r Push [MENU] to exit the set mode. 21 BASIC OPERATION 3

[TS]

1 Hz indicator Lights when kypad input is activated. Keypad

[F-INP]

DSelecting the 1 Hz step The minimum tuning step of 1 Hz can be used for ne tuning. q Push [TS] momentarily to turn the quick tuning step OFF M disappears. w Push [TS] for 1 sec. to toggle the 1 Hz tuning step ON and OFF. DBand edge warning beep When selecting a frequency that lies outside of a bands specified frequency range, a warning beep sounds. This function can be turned OFF in set mode, if de-

sired. (p. 81) DFrequency setting with the keypad The transceiver has a keypad for direct frequency entry as described below. q Push [F-INP]. F-INP indicator lights w Input the desired frequency. Input (decimal point) between the MHz units and kHz units. e Push [144 ENT] to enter the input frequency. To cancel the input, push [A/B] instead of [144 ENT].

[EXAMPLE]

14.025 MHz Push F-INP 1.8 1 10 4 GENE 50 0 3.5 2 14 5 144 ENT 706 kHz Push F-INP 50 0 GENE 21 7 50 0 18 6 144 ENT 21.280 MHz 21.245 MHz Push F-INP GENE 3.5 2 10 4 14 5 144 ENT 22 3 BASIC OPERATION I Operating mode selection SSB (USB/LSB), SSB data (USB data/LSB data), CW, CW reverse (CW-R), RTTY, RTTY-R (RTTY reverse), AM, AM data, FM and FM data modes are available in the IC-746PRO. Select the desired operation mode as follows. To select a mode of operation, push the desired mode switch momentarily. Push the switch again to toggle between USB and LSB, CW/CW-R and RTTY/RTTY-

R, AM and FM, if necessary. Push the switch for 1 sec. to toggle between CW and CW-R, RTTY and RTTY-R, or to select data mode, if necessary. See the diagram right below for the order of selection. Microphone signals are muted when data mode is selected. Selecting SSB mode Push [SSB] to select USB or LSB. USB is selected rst during above 10 MHz; or LSB is se-

lected rst during below 10 MHz operation. After USB or LSB is selected, push [SSB] to toggles be-

tween USB and LSB. After USB or LSB is selected, push [SSB] for 1 sec. to select USB data or LSB data mode, respectively. Selecting CW/RTTY mode Push [CW/RTTY] to select CW or RTTY. After CW/CW-R or RTTY/RTTY-R is selected, push

[CW/RTTY] to toggles between CW and RTTY. After CW or RTTY is selected, push [CW/RTTY] for 1 sec. to toggles between CW and CW reverse, or, RTTY and RTTY reverse mode, respectively. Selecting AM/FM mode Push [AM/FM] to select AM or FM. After AM or FM is selected, push [AM/FM] to toggles be-

tween AM and FM mode. After AM or FM is selected, push [AM/FM] for 1 sec. to select AM data or FM data mode, respectively.

[SSB] [CW/RTTY] [AM/FM]

D USB USB LSB D LSB SSB CW-R CW RTTY RTTY-R CW/RTTY D AM AM FM D FM AM/FM Push mode switch for 1 sec. Push mode switch momentarily. I Volume setting Rotate [AF] control to output a suitable audio level.

[AF] control AF RF/SQL Decreases Increases No audio output Max. audio output 23 BASIC OPERATION 3 I Squelch and receive (RF) sensitivity Adjusts the RF gain and squelch threshold level. The squelch removes noise output from the speaker

(closed position) when no signal is received. The squelch is particularly effective for FM. It is also avail-

able for other modes. The control can be set as the RF gain control only (squelch is xed open) or squelch control (RF gain is xed at maxi-

mum) in set mode (p. 81). See below right. The 11 to 12 oclock position is recommended for any set-

ting of the [RF/SQL] control.

[RF/SQL] control SET MODE RF+SQL

(default) SQL AUTO OPERATION Can be used in all modes. Functions as noise squelch or S-meter squelch in AM and FM; S-meter squelch only in other modes. Operates as a squelch control. RF gain is xed at max. sensitivity. Operates as an RF gain control in SSB, CW and RTTY. Squelch is xed open. Operates as an squelch control in AM and FM. RF gain is xed at max. sensitivity. Adjusting RF gain (Receive sensitivity) Normally, [RF/SQL] is set to the 11 oclock position. Rotate [RF/SQL] to the 11 oclock position for maxi-

mum sensitivity. Rotating counterclockwise from the maximum position re-

duces sensitivity. The S-meter indicates receive sensitivity. Adjusting squelch (Removing non-signal noise) Rotate [RF/SQL] clockwise, when receiving no signal, until the noise just disappears.

[RX] indicator light goes out. Rotating [RF/SQL] past the threshold point invokes the S-

meter squelch this allows you to set a minimum signal level needed to open the squelch. When setting as RF gain/squelch control Noise squelch (FM mode) Squelch is open. RF gain adjustable range Recommended level Maximum RF gain S-meter squelch When functioning as RF gain control (Squelch is xed open; SSB, CW, RTTY only) Maximum RF gain Adjustable range Minimum RF gain When functioning as squelch control (RF gain is xed at maximum) Noise squelch threshold

(FM mode) Squelch is open. Noise squelch (FM mode) S-meter squelch threshold S-meter squelch Shallow Deep 24 3 BASIC OPERATION I Basic transmit operation Before transmitting, monitor your selected oper-

ating frequency to make sure transmitting wont cause interference to other stations on the same frequency. DTransmitting Before transmitting, monitor your selected operating frequency to make sure transmitting wont cause inter-

ference to other stations on the same frequency. q Push [TRANSMIT] or [PTT] (microphone) to trans-

mit. The [TX] indicator lights red. w Push [TRANSMIT] again or release [PTT] (micro-

phone) to return to receive. DMicrophone gain adjustment Before transmitting, monitor your selected operating frequency to make sure transmitting wont cause inter-

ference to other stations on the same frequency. q Push [PTT] (microphone) to transmit. Talk into the microphone at your normal voice level. w While talking into the microphone, rotate [MIC GAIN] so that the ALC meter reading doesnt go outside the ALC zone (see right). w Release [PTT] (microphone) to return to receive.

[TRANSMIT]

[TX] indicator

[MIC GAIN]

[RF PWR]

ALC zone 25 RECEIVE AND TRANSMIT 4 I Operating SSB q Push a band key to select the desired band. w Push [SSB] to select LSB or USB. Below 10 MHz LSB is automatically selected; above 10 MHz USB is automatically selected. e Rotate [AF] to set audio to a comfortable listening level. r Rotate the tuning dial to tune a desired signal. S-meter indicates received signal strength. t Push [TRANSMIT] or [PTT] (microphone) to trans-

mit. The TX indicator lights red. y Speak into the microphone at your normal voice level. Adjust [MIC GAIN] at this step, if necessary. u Push [TRANSMIT] or release [PTT] (microphone) to return to receive. DConvenient functions for receive Preamp and attenuator (p. 48) Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON. P.AMP1, P.AMP2 or P.AMP appears when the preamp 1, preamp 2 or preamp is set to ON, respec-

tively. (depending on operating frequency band) Push [P.AMP/ATT] for 1 sec. to set the attenuator ON. Push [P.AMP/ATT] momentarily to turn the attenuator OFF. ATT appears when the attenuator is set to ON. Noise blanker (p. 51) Push [NB] to turn the noise blanker ON and OFF. NB appears when the noise blanker is set to ON. Push [NB] for 1 sec. to enter noise blanker set mode. Noise reduction (p. 53) Push [NR] to turn the noise reduction ON and OFF. Rotate [NR] control to adjust the noise reduction level. NR appears when the noise reduction is set to ON. DConvenient functions for transmit Speech compressor (p. 58) While M1 is selected with [MENU], push [F3 CMP] to turn the speech compressor ON and OFF. COMP appears when the speech compressor is set to ON. VOX (voice operated transmit) (p. 54) Push [VOX/BK-IN] to turn the VOX function ON and OFF. VOX appears when the VOX function is set to ON.

[TRANSMIT]

[TX] indicator Band keys

[MIC GAIN]

[SSB]

Tuning dial LSB or USB appeare Auto notch lter (p. 53) Push [A/NOTCH] to turn the auto or manual notch function ON and OFF. Rotate [NOTCH] control to set attenuate frequency for manual notch operation. Twin PBT (passband tuning) (p. 52) Rotate [TWIN PBT] controls (inner/outer). Push [PBTC] to clear the settings. AGC (auto gain control) (p. 49) While M1 is selected with [MENU], push

[F1 AGC] several times to select AGC F, AGC M, AGC S or AGC OFF. VSC (voice squelch control) (p. 00) While M2 is selected with [MENU], push

[F5 VSC] to turn the VSC function ON and OFF. The VSC indicator appears when the voice squelch function is set to ON. Transmit quality monitor (p. 57) Push [MONITOR] to turn the monitor function ON and OFF. MONI appears when the monitor function is set to ON. Audio tone control (p. 88) While M2 is selected with [MENU], push [F4 TCN], select an item with [F1 ] and [F2 ] then rotate the tuning dial to adjust the audio tone. 26

[TRANSMIT]

[TX] indicator Band keys

[CW PITCH]

[CW/RTTY]

Tuning dial

[KEY SPEED]

CW or CW-R appeare Auto notch lter (p. 53) Push [A/NOTCH] to turn the auto or manual notch function ON and OFF. Rotate [NOTCH] control to set attenuate frequency for manual notch operation. Twin PBT (passband tuning) (p. 52) Rotate [TWIN PBT] controls (inner/outer). Push [PBTC] to clear the settings. AGC (auto gain control) (p. 49) While M1 is selected with [MENU], push

[F1 AGC] several times to select AGC F, AGC M, AGC S or AGC OFF. 14 function (p. 21) While M1 is selected with [MENU], push

[F3 1/4] to turn the 14 function ON and OFF. 4 RECEIVE AND TRANSMIT I Operating CW q Push a band key to select the desired band. w Push [CW/RTTY] to select CW. After CW mode is selected, push [CW/RTTY] for 1 sec. to toggle between CW and CW-R modes. e Rotate [AF] to set audio to a comfortable listening level. r Rotate the tuning dial to simultaneously tune a de-

sired signal and its side tone. S-meter indicates received signal strength. t Push [TRANSMIT] to transmit. The TX indicator lights red. y Use the electric keyer or paddle to key your CW sig-

nals. The Po meter indicates transmitted CW signal strength. u Push [TRANSMIT] to return to receive. DConvenient functions for receive Preamp and attenuator (p. 48) Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON. P.AMP1, P.AMP2 or P.AMP appears when the preamp 1, preamp 2 or preamp is set to ON, respec-

tively. (depending on operating frequency band) Push [P.AMP/ATT] for 1 sec. to set the attenuator ON. Push [P.AMP/ATT] momentarily to turn the attenuator OFF. ATT appears when the attenuator is set to ON. Noise blanker (p. 51) Push [NB] to turn the noise blanker ON and OFF. NB appears when the noise blanker is set to ON. Push [NB] for 1 sec. to enter noise blanker set mode. Noise reduction (p. 53) Push [NR] to turn the noise reduction ON and OFF. Rotate [NR] control to adjust the noise reduction level. NR appears when the noise reduction is set to ON. DConvenient functions for transmit Break-in function (p. 56) Push [VOX/BK-IN] several times to set the break-

in OFF, semi break-in or full break-in. BK-IN or F BK-IN appears when the semi break-in or full break-in is set to ON, respectively. 27 RECEIVE AND TRANSMIT 4 Push for 1 sec. CW/RTTY Interference BFO Desired signal BFO Interference Desired signal CW mode (LSB side) CW-R mode (USB side)

[CW PITCH]

[KEY SPEED]

DAbout CW reverse mode CW reverse mode receives CW signals with a reverse side CW carrier point like that of LSB and USB modes. Use this mode when interfering signals are near the desired signal and you want to change the interference tone. Use when interfering signals are near a desired signal and you want to change the interference tone. q Push [CW/RTTY] several times to select CW mode. w Push [CW/RTTY] for 1 sec. to select CW or CW-R mode. Check the interfering tone. DAbout CW pitch control The received CW audio pitch and monitored CW audio can be adjusted to suit your preference (300 to 900 Hz in 25 Hz steps) without changing the operating fre-

quency. DAbout keying speed The transceivers internal electronic keyer speed can be adjusted from 6 to 60 wpm. Rotate [KEY SPEED] clockwise to increase keying speed; counterclockwise to decrease keying speed. DCW side tone function When the transceiver is in the receive condition (and the break-in function is OFF p. 56) you can listen to the tone of your CW signal without actually transmit-

ting. This allows you to match your transmit signal ex-

actly to another stations. This also convenient for CW practice. CW side tone level can be adjusted in keyer set mode (p. 33). 28 4 RECEIVE AND TRANSMIT I Electronic keyer functions The transceiver has a number of convenient functions for the electronic keyer that can be accessed from the memory keyer menu. q Push [CW/RTTY] to select CW mode. w Push [MENU] to select M1. e Push [F4 KEY] to select the memory keyer menu. The selectable menu can be changed with the keyer send menu in the set mode. (p. 86) r Push one of the multi-function keys ([F1] to [F5]) to select an item in the memory keyer menu. See the diagram below. Push [MENU] to return to the previous indication. DIN CW MODE A G C D U P 1 / 4 K E Y S C P F 1 F 2 F 3 F 4 F 5 Push [F4]

Memory keyer menu Push [MENU]

S N D E D T 0 0 1 S E T F 1 F 2 F 3 F 4 F 5 29

[MENU]

[CW/RTTY]

Keyer send menu (p. 40) Push

[F2]

Push

[F3]

Push

[F4]

Push

[F5]

M 1 M 2 M 3 M 4 - 1 F 1 F 2 F 3 F 4 F 5 Edit menu (p. 31) C Q T E S T C Q T E S T M 1 D E L S P C F 1 F 2 F 3 F 4 F 5 Contest number set mode (p. 32) N u m b e r S t y l e 1 N o r m a l F 1 F 2 F 3 F 4 F 5 Keyer set mode (p. 33) S i d e T o n e L e v e l 5 O %

1 F 1 F 2 F 3 F 4 F 5 RECEIVE AND TRANSMIT 4 0 0 1 M 1 M 2 M 3 M 4 - 1 F 1 F 2 F 3 F 4 F 5 DMemory keyer send menu Pre-set characters can be sent using the keyer send menu. Contents of the memory keyer are set using the edit menu. Transmitting q While M1 is selected in CW mode, push [F4 KEY]

to select the memory keyer menu. w Push [F2 SND] to select the keyer send menu. e Push [TRANSMIT] to set the transceiver to trans-

mit, or set the break-in function ON (p. 56). r Push one of the function keys ([F1] to [F4]) to send the contents of the memory keyer. Pushing a function key for 1 sec. repeatedly sends the contents; push any function key to cancel the transmis-

sion. The contest number counter, above [F5], is incremented each time the contents are sent. Push [F5] to reduce the contact number count by 1 when resending contents to unanswered calls. For your information When an external keypad is connected to the pin 3 and pin 7 of the [MIC] connector, the pro-

grammed contents, M1M4, can be transmitted without selecting the keyer send menu. See p. 86 for details. r Push [MENU] 2 times to return to M1. M1 send indication M2 send indication C Q T E S T C Q 0 0 1 M 1 M 2 M 3 M 4 - 1 U R 5 N N 0 0 1 B 0 0 1 M 1 M 2 M 3 M 4 - 1 F 1 F 2 Repeat send indication M2 send indication C Q T E S T C Q 0 0 1 M 1 M 2 M 3 M 4 - 1 U R 5 N N 0 0 1 B 0 0 1 M 1 M 2 M 3 M 4 - 1 Repeat indicators Count up trigger indicator Counter M3 send indication Q R Z ?

M 1 M 2 M 3 M 4 - 1 M4 send indication C F M T U 0 0 1 M 1 M 2 M 3 M 4 - 1 F 3 F 4 30 4 RECEIVE AND TRANSMIT DEditing a memory keyer The contents of the memory keyer memories can be set using the memory keyer edit menu. The memory keyer can memorize and re-transmit 4 CW key codes for often-used CW sentences, contact numbers, etc. Total capacity of the memory keyer is 50 characters per memory channel. Programming contents q Push [MENU] to select M1, then push [F4 KEY] to select the memory keyer menu. w Push [F3 EDIT] to select edit menu. Memory keyer contents of the channel 1 (M1) is indi-

cated. Push [F5] to manually increment the contest number. e Push [F1] to select the desired memory keyer chan-

nel to be edited. r Input the desired character by rotating the tuning dial or by pushing the keypad for number input. Selectable characters (with the tuning dial);

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z / ? . , * ^

NOTE:

^ is used to transmit a following word with no space such as AR. Put ^ before a text string such as ^AR, and the string AR is sent with no space.

* is used to insert the CW contact number. The contact number automatically increments by 1. This function is only available for one memory keyer channel at a time. Memory keyer channel M2 used * by default. t Push [F2 ] or [F3 ] to move the cursor back-

wards or forwards, respectively. Edit menu C Q T E S T C Q T E S T M 1 D E L S P C F 1 F 2 F 3 F 4 F 5 Move cursor left/right Input space Select M1 to M4 Clear character M2 default indication U R 5 N N * B K M 2 D E L S P C When inputting an astarisk, the counter is incremented by 1. y Repeat steps r and t to input the desired charac-

M3 default indication ters. u Push [MENU] 2 times to return to M1. Pre-programmed contents CH M1 CQ TEST CQ TEST DE JA1 JA1 TEST Contents M2 UR 5NN* BK M3 CFM TU M4 QRZ?

C F M T U M 3 D E L S P C M4 default indication Q R Z ?

M 4 D E L S P C Example display when inputting QSL TU DE JA3YUA TEST into M3. Q S L T U D E J A 3 Y M 3 D E L S P C D E J A 3 Y U A T E S T M 3 D E L S P C 31 DContest number set mode This menu is used to set the contest (serial) number and count up trigger, etc. Setting contents q Push [MENU] to select M1, then push [F4 KEY] to select the memory keyer menu. w Push [F4 001] to enter the contest number set mode. e Push [F1] or [F2 ] to select the desired set item. r Set the desired condition using the tuning dial. Push [F3] for 1 sec. to select a default condition or value. t Push [MENU] 2 times to return to M1. 1. Number Style This item sets the numbering system used for contact

(serial) numbers normal or morse cut numbers. Normal

: Does not use morse cut number

(default) 190 ANO : Sets 1 as A, 9 as N and 0 as O. 190 ANT : Sets 1 as A, 9 as N and 0 as T. 90 90 NO : Sets 9 as N and 0 as O. NT : Sets 9 as N and 0 as T. 2. Count Up Trig This item sets the count up trigger channel. M1, M2, M3 and M4 can be set. (default: M2) 3. Present Number This item shows the current number for the count up trigger channel set above. Rotate the tuning dial to change the number, or push

[F3 CLR] for 1 sec. to reset the current number to 001. RECEIVE AND TRANSMIT 4 S i d e T o n e L e v e l 5 O %

1 F 1 F 2 F 3 F 4 F 5 Set item up/down N u m b e r S t y l e 1 N o r m a l C o u n t U p T r i g M 2 2 P r e s e n t N u m b e r C L R 0 0 1 3 32 4 RECEIVE AND TRANSMIT DKeyer set mode This set mode is used to set the CW side tone, mem-

ory keyer repeat time, dash weight, paddle specica-

tions, keyer type, etc. Setting contents q Push [MENU] to select M1, then push [F4 KEY] to select the memory keyer menu. w Push [F5 SET] to select keyer set mode. e Push [F1] or [F2 ] to select the desired set item. r Set the desired condition using the tuning dial. Push [F3] for 1 sec. to select a default condition or value. t Push [MENU] 2 times to return to M1. 1. Side Tone Level This item sets the CW side tone output level. 0 to 100% in 1% step can be selected. 2. Side Tone L-lmt This item sets the CW side tone level limit. When the

[AF] control is rotated above a specied level, the CW side tone does not increase. ON OFF CW side tone level is limited. (default) CW side tone level is not limited. 3. Repeat Time When sending CW using the repeat timer, this item sets the time between transmission. 1 to 60 sec. in 1 sec. step can be selected. 4. Dot/Dash Ratio This item sets the dot/dash ratio. 1:1:2.8 to 1:1:4.5 (in 0.12 step) can be selected. Keying weight example: Morse code K DOT (fixed*) DASH DASH Weight setting:

1:1:3 (default) Weight setting:

Adjusted Adjustable range SPACE (fixed*) 33

*SPACE and DOT length can be adjusted with [KEY SPEED] only. S i d e T o n e L e v e l 5 O %

1 F 1 F 2 F 3 F 4 F 5 Set item up/down S i d e T o n e L e v e l 5 O %

1 S i d e T o n e L - l m t 2 O N R e p e a t T i m e 3 2 s D o t / D a s h R a t i o 4 1 : 1 : 3 . O RECEIVE AND TRANSMIT 4 5. Rise Time This item set the envelop time period which the output power becomes the set transmit power. 2, 4, 6 or 8 msec. can be selected. R i s e T i m e 5 4 m s About rise time Tx Key action Rx Tx output power Set Tx power level Time 6. Paddle Polarity This item sets the paddle polarity. Normal and reverse polarity can be selected. 7. Keyer Type This item selects the keyer type for [ELEC-KEY] con-

nector on the front panel. ELEC-KEY, BUG KEY and Straight key can be selected. 8. MIC U/D Keyer This item allow you to set the microphone [UP]/[DN]

keys to be used as a paddle. ON OFF

[UP]/[DN] switches can be used for CW.

[UP]/[DN] switches cannot be used for CW. NOTE: When ON is selected, the frequency and memory channel cannot be changed using the [UP]/[DN] switches. P a d d l e P o l a r i t y 6 N O R M A L K e y e r T y p e 7 E L E C - K E Y M I C U / D K e y e r 8 O F F 34 4 RECEIVE AND TRANSMIT I Operating RTTY (FSK) Before operating RTTY, be sure to consult the manual that come with your TNC. q Push a band key to select the desired band. w Push [CW/RTTY] several times to select RTTY. After RTTY mode is selected, push [CW/RTTY] for 1 sec. to toggle RTTY and RTTY-R modes. e Rotate [AF] to set audio to a comfortable listening level. r Rotate the tuning dial to tune a desired signal. S-meter indicates received signal strength. If the received signal cannot be demodulated, try select-

ing RTTY-R mode. t Push [TRANSMIT] to set the transceiver to the transmit condition or transmit a SEND signal from your TNC. The TX indicator lights red. The Po meter indicates transmitted RTTY signal strength. y Operate the connected PC or TNC (TU) to transmit RTTY (FSK) signals. Adjust [MIC GAIN] at this step, if necessary. u Push [TRANSMIT] to return to receive. DConvenient functions for receive Preamp and attenuator (p. 48) Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON. P.AMP1, P.AMP2 or P.AMP appears when the preamp 1, preamp 2 or preamp is set to ON, respec-

tively. (depending on operating frequency band) Push [P.AMP/ATT] for 1 sec. to set the attenuator ON. Push [P.AMP/ATT] momentarily to turn the attenuator OFF. ATT appears when the attenuator is set to ON. Noise blanker (p. 51) Push [NB] to turn the noise blanker ON and OFF. NB appears when the noise blanker is set to ON. Push [NB] for 1 sec. to enter noise blanker set mode. DConvenient functions for transmit Transmit quality monitor (p. 57) Push [MONITOR] to turn the monitor function ON and OFF. MONI appears when the monitor function is set to ON. 35

[TRANSMIT]

[TX] indicator Band keys

[CW/RTTY]

Tuning dial RTTY or RTTY-R appeared Noise reduction (p. 53) Push [NR] to turn the noise reduction ON and OFF. Rotate [NR] control to adjust the noise reduction level. NR appears when the noise reduction is set to ON. Twin PBT (passband tuning) (p. 52) Rotate [TWIN PBT] controls (inner/outer). Push [PBT C] to clear the settings. AGC (auto gain control) (p. 49) While M1 is selected with [MENU], push

[F1 AGC] several times to select AGC F, AGC M, AGC S or AGC OFF. 14 function (p. 21) While M1 is selected with [MENU], push

[F3 1/4] to turn the 14 function ON and OFF. RECEIVE AND TRANSMIT 4 I RTTY functions The transceiver has a number of convenient functions for the RTTY operation that can be accessed from the RTTY menu. q Push [CW/RTTY] to select RTTY mode. w Push [MENU] to select M1. e Push [F4 RTY] to select the RTTY menu. r Push one of the multi-function keys ([F2], [F4] or

[F5]) to select an item in the RTTY menu. See the diagram below. Push [MENU] to return to the previous indication. DIN RTTY MODE

[MENU]

[CW/RTTY]

A G C D U P 1 / 4 R T Y S C P D E C F I L S E T Switches RTTY filter ON and OFF. F 1 F 2 F 3 F 4 F 5 Push [F4]

RTTY menu R T T Y - F I L O N D E C F I L S E T F 1 F 2 F 3 F 4 F 5 Push

[F4]

RTTY filter set mode (p. 37) Push

[F4] for 1 sec. B a n d W i d t h 1 3 5 O F 1 F 2 F 3 F 4 F 5 F 1 F 2 F 3 F 4 F 5 Push [F2]

RTTY decoder screen (p. 38) A D J Push

[F5]

RTTY set mode (p. 39) R T T Y M a r k 1 2 1 2 5 F 1 F 2 F 3 F 4 F 5 F 1 F 2 F 3 F 4 F 5 DAbout RTTY reverse mode Received characters are occasionally garbled when the receive signal is reversed between MARK and Space. This reversal can be caused by incorrect TNC connections, setting, commands, etc. To receive re-

versed RTTY signal correctly, select RTTY-R mode. While RTTY mode is selected, push [CW/RTTY]

for 1 sec. to select the RTTY reverse mode. RTTY-R appears when the RTTY reverse mode is se-

lected. Push [CW/RTTY] for 1 sec. again to select the normal RTTY mode. Normal Reverse 170 Hz 2125 Hz 2125 Hz 170 Hz Space Mark BFO BFO Space Mark 36 4 RECEIVE AND TRANSMIT DRTTY lter/Twin peak lter The transceiver has 5 RTTY lters in addition to nor-

mal IF filters. The passband width can be selected from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz. When the RTTY lter is turned ON, the RTTY tuning meter can be used. Moreover, the twin peak lter changes the receive fre-

quency response by boosting 2 particular frequencies

(2125 and 2295 Hz) for better copying of desired RTTY signals. RTTY lter and twin peak lter setting q Push [CW/RTTY] to select RTTY mode. After RTTY mode is selected, push [CW/RTTY] for 1 sec. to select RTTY-R mode. w Push [MENU] several times to select M1. e Push [F4 RTY] to select RTTY menu. r Push [F4 FIL] to turn the RTTY lter ON and OFF. When the RTTY lter is turned ON, the normal IF lter number indication (1, 2 or 3) disappear. t Push [F4 FIL] for 1 sec. to enter RTTY filter set mode (see below). y Push [F1] to select bandwidth item. u Rotate the tuning dial to select the RTTY lter width from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz. Push [F3] for 1 sec. to select a default value. i Push [F2 ] to select twin peak lter item. The received audio volume may become greater when the twin peak lter is turned ON. o Rotate the tuning dial to turn the twin peak filter function ON and OFF.

!0 Push [MENU] 2 times to return to M1. RTTY lter set mode 1. Band Width This item sets the RTTY lter width. 250, 300, 350, 500 Hz and 1 kHz can be selected. 2. Twin Peak FIL This item turn the twin peak lter ON and OFF. 37 A G C D U P 1 / 4 R T Y S C P F 1 F 2 F 3 F 4 F 5 RTTY filter indicator Rotate the tuning dial at the point where the both sides of dots are appeared equality. Push [F4]

R T T Y - F I L O N D E C F I L S E T F 1 F 2 F 3 F 4 F 5 Disappears when the RTTY filter is turned OFF. B a n d W i d t h 1 3 5 O T w i n P e a k F I L O N 2 DRTTY decoder The transceiver has an RTTY decoder for Baudot

(mark freq.: 2125 Hz, shift freq.: 170 Hz, 45 bps). An external terminal unit (TU) or terminal node con-

nector (TNC) is not necessary for receiving a Baudot signal. q Push [CW/RTTY] to select RTTY mode. After RTTY mode is selected, push [CW/RTTY] for 1 sec. to select RTTY-R mode. w Push [MENU] several times to select M1. e Push [F4 RTY] to select RTTY menu. r Push [F4 FIL] to turn the RTTY lter ON. The RTTY decoder does not function when the RTTY l-

ter is turned OFF. t Push [F2 DEC] to turn the RTTY decoder ON. RTTY decoder screen appears. y Push [F2] to freeze the current screen. H appears while the function is in use. u Push [F3] for 1 sec. to clear the displayed charac-

ters. i Push [MENU] to exit the RTTY decoder screen. Setting the decoder threshold level Adjust the RTTY decoder threshold level if some char-

acters are displayed when no signal is received. q Call up the RTTY decoder screen as described at above. w Push [F1 ADJ] to select the threshold level setting condition. e Rotate the tuning dial to adjust the RTTY decoder threshold level. Push [F3] for 1 sec. to select the default condition. r Push [MENU] to exit the RTTY decoder screen. RECEIVE AND TRANSMIT 4 A G C D U P 1 / 4 R T Y S C P F 1 F 2 F 3 F 4 F 5 Push [F4]

R T T Y - F I L O N D E C F I L S E T F 1 F 2 F 3 F 4 F 5 Push [F2]

A D J F 1 F 2 F 3 F 4 F 5 Appears while the RTTY decoder screen is freezed with [F2] operation. Push [F3] to erase the displayed characters. A D J F 1 F 2 F 3 F 4 F 5 Push [F1]

9 A number of indicating line, the UnShift On Space

(USOS) function and new line code can be set in the RTTY set mode. (p. 39) F 1 F 2 F 3 F 4 F 5 Threshold level indication 38 4 RECEIVE AND TRANSMIT DRTTY set mode This set mode is used to set the mark and shift fre-

quencies, keying type, decode USOS function, etc. Setting contents q Push [MENU] to select M1, then push [F4 RTY] to select the RTTY menu. w Push [F5 SET] to select RTTY set mode. e Push [F1] or [F2 ] to select the desired set item. r Set the desired condition using the tuning dial. Push [F3] for 1 sec. to select a default condition or value. t Push [MENU] 2 times to return to M1. 1. RTTY Mark Sets the mark frequency for RTTY operation. 1275, 1615 and 2125 Hz are selectable. 2. RTTY Shift Sets the shift frequency for RTTY operation. 170, 200 and 425 Hz are selectable. 3. RTTY Keying Selects the keying polarity from normal and reverse. NORMAL Key open/close = Mark/Space REVERSE Key open/close = Space/Mark 4. Decode USOS Turn the USOS (UnShift On Space) function ON/OFF ON OFF Decode as letter code Decode as character code 5. Decode New Line Selects the new line code of the internal RTTY decoder. CR: Carriage Return; LF: Line Feed CR,LF,CR+LF CR+LF CR, LF and CR+LF CR+LF only 6. Decode Screen Selects a number of the decoder indication from 2 line and 3 line. 39 R T T Y M a r k 1 2 1 2 5 F 1 F 2 F 3 F 4 F 5 Set item up/down R T T Y M a r k 1 2 1 2 5 R T T Y S h i f t 2 1 7 O R T T Y K e y i n g 3 N O R M A L D e c o d e U S O S 4 O N D e c o d e N e w L i n e C R , L F , C R + L F 5 D e c o d e S c r e e n 6 3 l i n e RECEIVE AND TRANSMIT 4

[TRANSMIT]

[TX] indicator Band keys

[MIC GAIN]

[AM/FM] Tuning dial Appears I Operating AM q Push a band key to select the desired band. w Push [AM/FM] to select AM. e Rotate [AF] to set audio to a comfortable listening level. r Rotate the tuning dial to tune a desired signal. S-meter indicates received signal strength. The default tuning step for AM mode is 1 kHz; this can be changed using tuning step program mode. (p. 21) t Push [TRANSMIT] or [PTT] (microphone) to trans-

mit. The TX indicator lights red. y Speak into the microphone at your normal voice level. Adjust [MIC GAIN] at this step, if necessary. u Push [TRANSMIT] or release [PTT] (microphone) to return to receive. DConvenient functions for receive Preamp and attenuator (p. 48) Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON. P.AMP1, P.AMP2 or P.AMP appears when the preamp 1, preamp 2 or preamp is set to ON, respec-

tively. (depending on operating frequency band) Push [P.AMP/ATT] for 1 sec. to set the attenuator ON. Push [[p.AMP/ATT] momentarily to turn the attenuator OFF. ATT appears when the attenuator is set to ON. Noise blanker (p. 51) Push [NB] to turn the noise blanker ON and OFF. NB appears when the noise blanker is set to ON. Push [NB] for 1 sec. to enter noise blanker set mode. Noise reduction (p. 53) Push [NR] to turn the noise reduction ON and OFF. Rotate [NR] control to adjust the noise reduction level. NR appears when the noise reduction is set to ON. DConvenient functions for transmit Speech compressor (p. 58) While M1 is selected with [MENU], push [F3 CMP] to turn the speech compressor ON and OFF. COMP appears when the speech compressor is set to ON. VOX (voice operated transmit) (p. 54) Push [VOX/BK-IN] to turn the VOX function ON and OFF. VOX appears when the VOX function is set to ON. Auto notch lter (p. 53) Push [A/NOTCH] to turn the auto or manual notch lter ON and OFF. Rotate [NOTCH] control to set attenuate frequency for manual notch operation. IF shift (p. 52) Rotate [TWIN PBT] controls (inner only). Push [PBTC] to clear the settings. AGC (auto gain control) (p. 49) While M1 is selected with [MENU], push [F1 AGC] several times to select AGC F, AGC M, AGC S or AGC OFF. VSC (voice squelch control) (p. 00) While M2 is selected with [MENU], push

[F5 VSC] to turn the VSC function ON and OFF. The VSC indicator appears when the voice squelch function is set to ON. Transmit quality monitor (p. 57) Push [MONITOR] to turn the monitor function ON and OFF. MONI appears when the monitor function is set to ON. Audio tone control (p. 88) While M2 is selected with [MENU], push [F4 TCN], select an item with [F1 ] and [F2 ] then rotate the tuning dial to adjust the audio tone. 40 4 RECEIVE AND TRANSMIT I Operating FM q Push a band key to select the desired band. w Push [AM/FM] to select FM. e Rotate [AF] to set audio to a comfortable listening level. r Rotate the tuning dial to tune a desired signal. S-meter indicates received signal strength. t Push [TRANSMIT] or [PTT] (microphone) to trans-

mit. The TX indicator lights red. y Speak into the microphone at your normal voice level. Adjust [MIC GAIN] at this step, if necessary. u Push [TRANSMIT] or release [PTT] (microphone) to return to receive.

[TRANSMIT]

[TX] indicator Band keys

[MIC GAIN]

[AM/FM] Tuning dial Appear DConvenient functions for receive Preamp and attenuator (p. 48) Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON. P.AMP1, P.AMP2 or P.AMP appears when the preamp 1, preamp 2 or preamp is set to ON, respec-

tively. (depending on operating frequency band) Push [P.AMP/ATT] for 1 sec. to set the attenuator ON. Push [[p.AMP/ATT] momentarily to turn the attenuator OFF. ATT appears when the attenuator is set to ON. Noise blanker (p. 51) Push [NB] to turn the noise blanker ON and OFF. NB appears when the noise blanker is set to ON. Push [NB] for 1 sec. to enter noise blanker set mode. DConvenient functions for transmit Speech compressor (p. 58) While M1 is selected with [MENU], push [F3 CMP] to turn the speech compressor ON and OFF. COMP appears when the speech compressor is set to ON. VOX (voice operated transmit) (p. 54) Push [VOX/BK-IN] to turn the VOX function ON and OFF. VOX appears when the VOX function is set to ON. Noise reduction (p. 53) Push [NR] to turn the noise reduction ON and OFF. Rotate [NR] control to adjust the noise reduction level. NR appears when the noise reduction is set to ON. Auto notch lter (p. 53) Push [A/NOTCH] to turn the auto or manual notch lter ON and OFF. Rotate [NOTCH] control to set attenuate frequency for manual notch operation. VSC (voice squelch control) (p. 00) While M2 is selected with [MENU], push

[F5 VSC] to turn the VSC function ON and OFF. The VSC indicator appears when the voice squelch function is set to ON. Transmit quality monitor (p. 57) Push [MONITOR] to turn the monitor function ON and OFF. MONI appears when the monitor function is set to ON. Audio tone control (p. 88) While M2 is selected with [MENU], push [F4 TCN], select an item with [F1 ] and [F2 ] then rotate the tuning dial to adjust the audio tone. 41 DTone squelch operation Tone squelch operation is a method of communica-

tions using selective calling. Only received signal hav-

ing a matching tone will open the squelch. Before communicating using tone squelch, all members of your party must agree on the tone squelch frequency to use. q Push [AM/FM] to select FM mode. w Push [MENU] several times to select M1. e Push [F4 TON] several times to turn the tone squelch function ON. TSQL appears r Push [F4 TONE] for 1 sec. to enter tone frequency set mode. t Push [F1 TON] several times until TSQL Tone appears, if necessary. y Rotate the tuning dial to select the desired tone squelch frequency. Push [F3] for 1 sec. to select the default frequency. u Push [MENU] to return to M1. i Communicate in the usual manner. RECEIVE AND TRANSMIT 4 A G C D U P C M P T O N S C P F 1 F 2 F 3 F 4 F 5 Push [F4] for 1 sec. T S Q L T o n e T O N S C N 8 8 . 5 H z F 1 F 2 F 3 F 4 F 5 Available tone squelch frequencies 186.2 189.9 192.8 196.6 199.5 203.5 206.5 165.5 167.9 171.3 173.8 177.3 179.9 183.5 085.4 088.5 091.5 094.8 097.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 67.0 69.3 71.9 74.4 77.0 79.7 82.5

(Unit: Hz) 254.1 210.7 218.1 225.7 229.1 233.6 241.8 250.3 42 A G C D U P C M P T O N S C P F 1 F 2 F 3 F 4 F 5 Push [F4] for 1 sec. D T C S C o d e T O N S C N O 2 3 - N N F 1 F 2 F 3 F 4 F 5 Select a code with the tuning dial. Push [F5] to select the polarity 4 RECEIVE AND TRANSMIT DDTCS operation DTCS function is an another method of communica-

tions using selective calling. Only received signal hav-

ing a matching 3-digit code will open the squelch. q Push [AM/FM] to select FM mode. w Push [MENU] several times to select M1. e Push [F4 TON] several times to turn the DTCS function ON. DTCS appears r Push [F4 TON] for 1 sec. to enter tone frequency set mode. t Push [F1 TON] several times until DTCS Code appears, if necessary. y Rotate the tuning dial to select the desired DTCS code number and push [F5] to select the desired code polarity. NN : Normal polarity is used for both transmit and receive. NR : Normal polarity is used for transmit, reversed polarity is used for receive. RN : Reversed polarity is used for transmit, normal polarity is used for receive. RR : Reversed polarity is used for both transmit and receive. Push [F3] for 1 sec. to select the default code and polar-

ity. u Push [MENU] to return to M1. i Communicate in the usual manner. Available tone codes 023 025 026 031 032 036 043 047 051 053 054 065 071 072 073 074 114 115 116 122 125 131 132 134 143 145 152 155 156 162 165 172 174 205 212 223 225 226 243 244 245 246 251 252 255 261 263 265 266 271 274 306 311 315 325 331 332 343 346 351 356 364 365 371 411 412 413 423 431 432 445 446 452 454 455 462 464 465 466 503 506 516 523 526 532 546 565 606 612 624 627 631 632 654 662 664 703 712 723 731 732 734 743 754 43 I Repeater operation A repeater amplies received signals and retransmits them at a different frequency. When using a repeater, the transmit frequency is shifted from the receive fre-

quency by an offset frequency. A repeater can be ac-

cessed using split frequency operation with the shift frequency set to the repeaters offset frequency. q Push a band key to select the desired band. w Push [A/B] to select VFO A. e Push [AM/FM] to select FM. Pushing [AM/FM] toggles between AM and FM. r Rotate the tuning dial to set the repeater transmit frequency. t While M1 is selected, push [F2 DUP] several times to set the offset direction. DUP or DUP+ appears 0.100 MHz for 50 MHz and 0.600 MHz for 144 MHz band is set by default in set mode. (p. 82) for HF, 0.500 MHz y Push [F4 TON] to turn the repeater tone ON. T appears. Set the tone frequency in tone frequency set mode in advance, if desired. (p. 45) 88.5 Hz is set by default. To transmit a 1750 Hz European repeater tone, push [F4 TON] while transmitting. u Communicate in the normal way. DOne-touch repeater function This function allow you to set repeater operation with push of one switch. To set the transceiver for repeater operation using the one-touch repeater function, follow the steps q to r as above, then push [F2 DUP] for 1 sec. Set the offset shift direction and frequency in ad-

vance (p. 82) as well as the tone frequency (see p. 45). RECEIVE AND TRANSMIT 4 A G C D U P C M P T O N S C P F 1 F 2 F 3 F 4 F 5 Push [F2], [F4]

1 4 5 . O 8 O O O A G C D U P C M P T O N S C P F 1 F 2 F 3 F 4 F 5 Appear A G C D U P C M P T O N S C P F 1 F 2 F 3 F 4 F 5 Push [F2] for 1 sec. 1 4 5 . O 8 O O O A G C D U P C M P T O N S C P F 1 F 2 F 3 F 4 F 5 Appear 44 4 RECEIVE AND TRANSMIT DTransmit frequency monitor check You may be able to receive the other partys transmit signal directly without having to go through a repeater. This function allows you to check this. While receiving, push and hold [XFC] to see if you can receive the other partys transmit signal directly. While holding [XFC], the offset direction and frequency are displayed on the multi-function switch indicator. DRepeater tone frequencies The transceivers repeater tone frequency is set to 88.5 Hz by default. This can be changed if desired. q While M1 is selected, push [F4 TON] to turn the tone encoder ON. T appears. w Push [F4 TON] for 1 sec. to select the tone fre-

quency set mode. e Push [F1 TON] several times to select Rptr Tone, if necessary. r Rotate the tuning dial to select the desired fre-

quency. (see the table at right) t Push [MENU] to return to M1. DStoring a non standard repeater q Turn the auto repeater function OFF in the set mode. (p. 83) w Push [AM/FM] to select FM mode. e Push [V/M], then [A/B] to select VFO A. r Rotate the tuning dial to set the repeater output fre-

quency. Set the tuning step if desired. t Push [A/B] to select VFO B. y Rotate the tuning dial to set the repeater input fre-

quency. u Push [A/B] to select VFO A. i Push [SPLIT] to turn the split function ON. o Push [F4 TON] to turn the previously set tone en-

coder ON.

!0 Rotate [M-CH] to select the desired memory chan-

nel. BLANK appears when blank channel is selected.

!1 Push [MW] for 1 sec. to store the contents in the se-

lected memory channel. 45

[XFC]

- 6 O O . O k A G C D U P C M P T O N S C P R p t r T o n e T O N S C N 8 8 . 5 H z Available tone frequencies

(Unit: Hz) 67.0 69.3 71.9 74.4 77.0 79.7 82.5 085.4 088.5 091.5 094.8 097.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 165.5 167.9 171.3 173.8 177.3 179.9 183.5 186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7 218.1 225.7 229.1 233.6 241.8 250.3 254.1

[MW]

[V/M]

[AM/FM] [SPLIT] [A/B] [M-CH]

RECEIVE AND TRANSMIT 4 A u t o R e p e a t e r 1 8 O N - 1 A u t o R e p e a t e r 1 8 O N - 2 A u t o R e p e a t e r 1 8 O F F DAuto repeater function This function automatically activates the repeater set-

tings (DUP or DUP+ and/or tone encoder ON/OFF) when the operating frequency falls within the general repeater output frequency range and deactivates them when outside of the range. Set the auto repeater function ON-1 or ON-2 in set mode in advance (p. 83). When set ON-1 or ON-2, re-

peater settings are automatically activated according to the table below. ON-1 automatically set the duplex setting and ON-2 automatically sets the duplex setting and tone encoder automatically. Frequency range and offset direction FREQUENCY RANGE 145.200145.495 MHz 146.610146.995 MHz 147.000147.395 MHz DUPLEX DIRECTION minus duplex minus duplex plus duplex 46