FCC ID: DBZIFBT494A Wireless Microphone Transmitter

INSTRUCTION MANUAL IFBT4 Synthesized UHF IFB Transmitter Featuring Digital Hybrid Wireless Technology U.S. Patent 7,225,135 Fill in for your records:

Serial Number:

Purchase Date:

Rio Rancho, NM, USA www.lectrosonics.com 2 IFBT4LECTROSONICS, INC. Table of Contents General Technical Description ..............................................................................................................................................................4 Introduction ...........................................................................................................................................................................................4 Audio Input Interface .............................................................................................................................................................................4 Input Limiter ..........................................................................................................................................................................................4 Audio DSP and Noise Reduction ..........................................................................................................................................................5 Pilot Tone Squelch System ...................................................................................................................................................................5 Frequency Agility...................................................................................................................................................................................5 Power Delay ..........................................................................................................................................................................................5 Microcontroller ......................................................................................................................................................................................5 Transmitter ............................................................................................................................................................................................5 Antenna System ....................................................................................................................................................................................5 Front Panel Controls and Functions .....................................................................................................................................................6 IFBT4 Front Panel .................................................................................................................................................................................6 OFF/TUNE/XMIT Switch .......................................................................................................................................................................6 Power Up Sequence .............................................................................................................................................................................6 Main Window .........................................................................................................................................................................................6 Frequency Window................................................................................................................................................................................6 Audio Input Gain Window ......................................................................................................................................................................6 Setup Window .......................................................................................................................................................................................6 ROLLOFF Setup Screen .......................................................................................................................................................................6 COMPAT Setup Screen .........................................................................................................................................................................7 TUNING Setup Screen .........................................................................................................................................................................7 Lock/Unlock Panel Buttons ...................................................................................................................................................................7 IFBT4 Menu Diagram ............................................................................................................................................................................7 Rear Panel Controls and Functions ......................................................................................................................................................9 IFBT4 Rear Panel .................................................................................................................................................................................9 XLR Jack ...............................................................................................................................................................................................9 MODE Switches ....................................................................................................................................................................................9 Power Input Connector .........................................................................................................................................................................9 Antenna .................................................................................................................................................................................................9 Installation and Operation ...................................................................................................................................................................10 Operating Notes ....................................................................................................................................................................................10 Accessories ..........................................................................................................................................................................................11 Troubleshooting ....................................................................................................................................................................................12 Frequency Blocks and Ranges ...........................................................................................................................................................13 UHF Transmitter Antenna Specifications ............................................................................................................................................13 Specifications .......................................................................................................................................................................................14 Service and Repair ...............................................................................................................................................................................15 Returning Units for Repair ..................................................................................................................................................................15 3 Multi-Frequency IFB TransmitterRio Rancho, NM General Technical Description Introduction Audio Input Interface The IFBT4 IFB transmitter brings DSP capability and a convenient LCD interface to the popular Lectrosonics IFB product line. Replacing the venerable IFBT1 trans-

mitter, the IFBT4 retains the same physical size and is fully interchangeable with its predecessor in terms of audio, RF and power interfaces. Along with providing peerless audio quality with wide frequency response and dynamic range in Nu Hybrid mode, the technol-

ogy used in the IFBT4 includes compatibility modes for Lectrosonics Mode 3 and IFB receivers. The IFBT4 features a graphics type backlit LCD display with a menu system similar to those featured in our 400 Series receivers. The IFBT4 can be Locked to prevent a user from changing any settings but still allow brows-

ing of the current settings. The IFBT4 can be powered from any external DC source of 6 to 18 Volts at 200 milliamps maximum or from the provided 12 Volt power supply with a locking power connector. The unit has an internal self-resetting fuse and reverse polarity protection. The IFBT4 is housed in a machined aluminum case with a tough electrostatic powder coating. The front and rear panels are anodized aluminum with laser etched engraving. The included antenna is a right angle, wavelength monopole with a BNC connector, construct-

ed of polymer coated flexible steel cable. These features, along with the 250 milliwatt RF output and a wide range of selectable audio input types and levels, make the IFBT4 an excellent choice for long range IFB applications and other long range wireless audio needs. The standard 3 pin XLR connector on the rear panel handles all audio inputs. The four DIP switches allow setting the input sensitivity for low levels, such as micro-

phone inputs, or for high levels, such as line inputs, bal-

anced or unbalanced. The switches also offer special settings to provide the proper input configurations to match to Clear Com, RTS1, and RTS2 intercom sys-

tems. Pin 1 of the XLR input connector is normally con-

nected to ground but an internal jumper can be moved if a floating input is desired. While the XLR input does not offer phantom power, it is fully compatible with standard 48 Volt phantom power. Phantom supplied microphones may be connected to the IFBT4 without the need for DC isolation. A user-selectable low frequency roll-off can be set for 35 Hz or 50 Hz. The recommended 50 Hz default set-

ting helps to remove wind and traffic noise, air con-

ditioner rumble, and other sources of undesired low frequency audio. The 35 Hz setting offers a fuller range of sound in the absence of adverse conditions. Input Limiter A DSP-controlled analog audio limiter is employed before the analog-to-digital converter. The limiter has a range of more than 30 dB for excellent overload protec-

tion. A dual release envelope makes the limiter acousti-

cally transparent while maintaining low distortion. It can be thought of as two limiters in series: a fast attack and IFBT4 Transmitter Block Diagram XLR Input Connector 3 2 1 Audio Input Interface Mode Set Switches

(Rear Panel) Input Amplifier Input Amp Audio A-D Converter D-A Converter LF Roll-Off Audio Level 11001001 11001001 Digital Signal Processor Shunt Limiter Filter Amp 11.3 MHz Reference Voltage Controlled Oscillator Final Amplifier 50 Isolator Graphic LCD Display Microprocessor Front Panel Controls UP DOWN MENU Phase Locked Loop 11.3 MHz Reference

+5 V

+3.3 V

+1.8 V

-5 V Power Input 6-18VDC 200mA

+

-

Polyfuse Voltage Regulator Power OFF TUNE XMIT 4 IFBT4LECTROSONICS, INC. release limiter followed by a slower attack and release limiter. The dual release limiter recovers quickly from brief transients but recovers more slowly from sustained high levels, keeping audio distortion low while preserv-

ing short term dynamic changes. When the audio meter on the LCD display widens slightly as it reaches zero, limiting is indicated. When the zero changes to a letter C, severe limiting and/or clipping is indicated. Power Delay When powering the transmitter on and off, and when switching between the XMIT and TUNE modes, intel-

ligent circuitry adds brief delays in order to allow time for circuits to stabilize, both locally and in the matching receiver. These delays prevent clicks, thumps or feed-

back from entering the sound system. Audio DSP and Noise Reduction Microcontroller The microcontroller oversees most system operations, including RF frequency and output, DSP audio func-

tions, buttons and display, and more. User settings are stored in non-volatile memory, so they are retained even when the power is turned off. Transmitter The IFBT4 transmitter operates at a high RF power level to ensure a clean signal free of dropouts and noise. All transmitter circuits are buffered and filtered for excellent spectral purity. The IFBT4s clean signal reduces the chances for interference in multiple trans-

mitter installations. Antenna System The 50 Ohm BNC output connector will work with stan-

dard coaxial cabling and remote antennas. Lectrosonics IFB systems use a single band compan-

dor and pre-emphasis for exceptional IFB audio quality. The IFBT4 performs these traditionally analog functions entirely in the digital domain, maintaining historical compatibility while requiring fewer adjustments. When the IFBT4 is configured for compatibility with other types of wireless systems, the DSP stops IFB com-

panding and instead performs the appropriate audio processing for the chosen mode. The Nu Hybrid mode offers objectively superior audio performance and is recommended when the receiver is capable of support-

ing it. Pilot Tone Squelch System Lectrosonics IFB systems use a special pilot tone so that valid IFB signals can be distinguished from RF interference. During normal operation, an IFB receiver will listen for the distinctive pilot tone, remaining silent

(squelched) until the pilot tone is detected. The pilot tone is located well above audio frequencies and is never passed through to the receivers audio output. The benefit of the pilot tone squelch system is that the receiver will remain muted until it receives the pilot tone from the matching transmitter, even if a strong interfer-

ing RF signal is present on the carrier frequency of the system. When the IFBT4 is operated in compatibility modes other than IFB, it generates pilot tones as appropriate for the chosen mode. Frequency Agility The IFBT4 transmitter uses a synthesized, frequency selectable main oscillator. The frequency is extremely stable over a wide temperature range and over time. The transmitters standard tuning range covers 256 fre-

quencies in 100 kHz steps over a 25.6 MHz band. This flexibility significantly helps avoid interference problems in mobile or traveling applications. 5 Multi-Frequency IFB TransmitterRio Rancho, NM Front Panel Controls and Functions IFBT4 Front Panel In XMIT mode, it is not possible to change the operating frequency. In TUNE mode, the Up and Down buttons may be used to select a new frequency. If the TUNING mode is set to NORMAL, the Up and Down buttons navigate in single channel increments, and MENU+Up and MENU+Down move 16 channels at a time. In any of the various group tuning modes, the currently selected group identifier is displayed to the left of the hex code, and the Up and Down buttons navigate among the frequencies in the group. In factory group tuning modes A thru D, MENU+Up and MENU+Down jump to the highest and lowest frequencies in the group. In user group tuning modes U and V, MENU+Up and MENU+Down permit access to frequencies not currently in the group. Pressing and holding the Up or Down button invokes an autorepeat function, for faster tuning. Audio Input Gain Window Pressing the MENU button once from the Frequency window navigates to the Audio Input Gain window. This window greatly resembles the Main window, with the exception that the current audio input gain setting is displayed in the upper left corner. The Up and Down buttons may be used to alter the setting while reading the realtime audio meter to determine what setting works best. The gain range is -18 dB to +24 dB with 0 dB nominal center. The reference for this control can be changed with the rear panel MODE switches. See the Installation and Operation section for more information on the MODE switches. Setup Window Pressing the MENU button once from the Audio Input Gain window navi-

gates to the Setup window. This window contains a menu which permits access to various setup screens. Initially the active menu item is EXIT. Pressing the Up and Down keys permits navigation among the remain-

ing menu items: TUNING, COMPAT and ROLLOFF. Pressing the MENU button selects the current menu item. Selecting EXIT navigates back to the Main window. Select-

ing any other item navigates to the associated setup screen. ROLLOFF Setup Screen The ROLLOFF setup screen controls the low frequency audio response of the IFBT4 by moving the 3 dB corner of a 4 pole low-

pass digital filter. The 50 Hz setting is the default, and should be used whenever wind noise, HVAC rumble, traffic noise or other low frequency sounds may de-

grade the quality of the audio. The 35 Hz setting may be used in the absence of adverse conditions, for a fuller bass response. Press MENU to return to the Setup window. OFF/TUNE/XMIT Switch OFF Turns the unit off. TUNE Allows all functions of the transmitter to be set up, without transmitting. The operating frequency may only be selected in this mode. XMIT Normal operating position. The operating frequency may not be changed in this mode, though other settings may be changed, so long as the unit isnt Locked. Power Up Sequence When power is first turned on, the front panel LCD dis-

play steps through the following sequence. 1. Displays Model and frequency block number

(e.g. IFBT4 BLK 25). 2. Displays installed firmware version number

(e.g. VERSION 1.0). 3. Displays the current compatibility mode setting

(e.g. COMPAT IFB). 4. Displays the Main Window. Main Window The Main window is dominated by an audio level meter, which displays the current audio modulation level in real time. In TUNE mode, a blinking capital T is displayed in the lower left corner to remind the user that the unit is not yet trans-

mitting. In XMIT mode, the blinking T is replaced by an antenna icon. Audio limiting is indicated when the audio bargraph extends all the way to the right and widens somewhat. Clipping is indicated when the zero in the lower right corner changes to a capital C. The Up and Down buttons are disabled in this Window. Frequency Window Pressing the MENU button once from the Main window navigates to the Fre-

quency window. The Frequency window displays the cur-

rent operating frequency in MHz, as well as the standard Lectrosonics hex code for use with transmitters equipped with hex switches. Also displayed is the UHF television channel to which the selected frequency belongs. 6 IFBT4LECTROSONICS, INC. COMPAT Setup Screen TUNING Setup Screen The COMPAT setup screen selects the current compatibility mode, for interoperation with various types of receivers. The avail-

able modes are:

Nu Hybrid - This mode offers the best audio quality and is recommended if your receiver supports it. IFB - Lectrosonics IFB compatibility mode. This is the default setting and is the appropriate setting to use with a compatible IFB receiver. MODE 3 - Compatible with certain non-Lectrosonics receivers. (Contact factory for more information.) Press MENU to return to the Setup window. NOTE: If your Lectrosonics receiver does not have Nu Hybrid mode, use Euro Digital Hybrid Wireless (EU Dig. Hybrid). IFBT4 Menu Diagram The TUNING setup screen allows selection of one of four factory set frequency groups (Groups A through D), two user pro-

grammable frequency groups (Groups U and V) or the choice to not use groups at all. In the four factory set frequency groups, eight frequen-

cies per group are preselected. These frequencies are chosen to be free of intermodulation products. (Refer to receiver manual for more information). In the two user programmable frequency groups, up to 16 frequencies can be programmed per group. Note: The TUNING Setup Screen only selects the tuning mode (NORMAL or Group tuning) and not the operating frequency. Actual operating frequencies are chosen through the Frequency Window. Press MENU to return to the Setup window. Lock/Unlock Panel Buttons To enable or disable the control panel buttons, navigate to the Main Window and press and hold the MENU but-

ton for about 4 seconds. Continue holding the button as a progress bar extends across the LCD. When the bar reaches the right side of the screen, the unit will toggle to the opposite locked or unlocked mode. Press UP or DOWN arrow Display External Power Voltage

(added feature with firmware Ver. 1.4) 7 Multi-Frequency IFB TransmitterRio Rancho, NM Frequency Window Behavior, based on TUNING mode selections Adding/Deleting User Programmable Frequency Group Entries Note: Each User Programmable Frequency Group

(u or v) has separate contents. We recommend that you consider the larger issue of frequency coordination prior to adding frequencies in order to minimize potential intermodulation problems. 1. Start from the Frequency window and verify that a lower case u or v is present next to the transmit-

ter switch settings. 2. While pressing and holding the MENU button press either the Up or Down button to move to one of the 256 available frequencies in the block. Whenever the selection comes to rest on a frequency that is in the current group, the group tuning mode indicator

(letter u or v) will give a steady indication. On frequencies that are not in the group, the indicator will blink. 3. To add or remove the displayed frequency from the group, hold down the MENU button while pressing and holding the Up button. The group tuning mode indicator will stop blinking to show that the frequen-

cy has been added to the group, or begin blinking to indicate that the frequency has been removed from the group. If NORMAL tuning mode is selected, the Up and Down buttons select the operating frequency in single chan-

nel (100 kHz) increments and the MENU+Up and MENU+Down shortcuts tune in 16 channel (1.6 MHz) increments. There are two classes of group tuning: factory preset groups (Grp A through D) and user programmable fre-

quency groups (Grp U and V). In any of the group modes, a lower case a, b, c, d, u or v will be displayed to the immediate left of the transmit-

ter switch settings in the Frequency window. The letter identifies the selected factory or user tuning group. Any time the currently tuned frequency is not in the current group, this group identification letter will blink. Any time the currently tuned frequency is in the current tun-

ing group, the group tuning mode indicator will give a steady (non-blinking) indication. In any of the group modes, the Up and Down buttons navigate among the selected intermod-free frequen-

cies in the group. In factory groups (A through D), the MENU+Up and MENU+Down shortcuts jump to the first and last frequencies in the group. In user groups (U and V), MENU+Up and MENU+Down permit access to frequencies not already in the group. User Programmable Frequency Group Behavior The user programmable frequency groups U or V work very similarly to the factory groups with a few exceptions. The most obvious difference is the ability to add or remove frequencies from the group. Less obvious is the behavior of a user programmable frequency group with only one entry, or with no entries. A user programmable frequency group with only one en-

try continues to display the single frequency stored in the group no matter how many times the Up or Down buttons are pressed (provided the MENU button is not pressed at the same time). The U or V will not blink. A user programmable frequency group with no entries re-

verts to non-group-mode behavior, i.e., access is allowed to all available frequencies in the selected receiver mod-

ules frequency block. When there are no entries, the U or V will of course blink. However, once a frequency has been added to the tuning group, this behavior changes to group-mode behavior where the MENU button must be pressed and held while either the Up or Down buttons are pressed to access frequencies that are not part of the current tuning group. 8 IFBT4LECTROSONICS, INC. Rear Panel Controls and Functions IFBT4 Rear Panel Power Input Connector The IFBT4 is designed to be used with the DCR12/A5U external (or equivalent) power source. The nominal voltage to operate the unit is 12 VDC, although it will operate at voltages as low as 6 VDC and as high as 18 VDC. External power sources must be able to supply 200 mA continuously. The connector dimensions are shown below. Lectroson-

ics P/N 21425 has a straight back shell. P/N 21586 has a locking collar. 375 to

.475 typ. Straight or with locking collar Antenna The ANTENNA connector is a standard 50 ohm BNC type for use with standard coaxial cabling and remote antennas. XLR Jack A standard XLR female jack accepts a variety of input sources depending on the setting of the rear panel MODE switches. XLR pin functions can be changed to suit the source depending on the positions of the individual switches. For detailed information on the setting of these switches see the Installation and Operation section. MODE Switches The MODE switches allow the IFBT4 to accommodate a variety of input source levels by changing the input sensitivity and the pin functions of the input XLR jack. Marked on the rear panel are the most common set-

tings. Each setting is detailed below. Switches 1 and 2 adjust the XLR pin functions while switches 3 and 4 adjust the input sensitivity. Switch XLR Pins Positions 1 2 3 4 3 = Audio 1 = Common Name CC q q q p MIC p p p q 2 = Hi 3 = Lo 1 = Common LINE p p q q 2 = Hi 3 = Lo 1 = Common RTS1 p q q q 2 = Hi RTS2 q q q q 3 = Hi 1 = Common 1 = Common Input Balanced Sensitivity No Yes

-10 dBu

-42 dBu Yes 0 dBu No No 0 dBu 0 dBu 9 Multi-Frequency IFB TransmitterRio Rancho, NM Installation and Operation 1) The IFBT4 transmitter is shipped with pin 1 of the XLR input connector tied directly to ground. If a floating input is desired, a Ground Lift Jumper is provided. This jumper is located inside the unit on the PC board near the rear panel XLR jack. For floating input, open the unit and move the Ground Lift Jumper to the desired location. Location of Ground Lift Jumper:

4) Insert the microphone or other audio source XLR plug into the input jack. Ensure that the pins are aligned and that the connector locks into place. 5) Attach the antenna (or antenna cable) to the BNC connector on the rear panel. 6) Set the OFF/TUNE/XMIT switch to TUNE. 7) Press the MENU button to display the Frequency Window and adjust the transmitter to the desired frequency with the front panel Up and Down but-

tons. 8) Position the microphone. The microphone should be placed where it will be located during actual use. 9) Use the MENU button to navigate to the Audio Input Gain Window. While speaking at the same voice level that will be present during actual use, observe the audio meter display. Use the Up and Down but-

tons to adjust the audio input gain so that the meter reads close to 0 dB, but only rarely exceeds 0 dB

(limiting). 10) Once the transmitter audio gain has been set, the receiver and other components of the system can be turned on and their audio levels adjusted. Set the power switch on the IFBT4 transmitter to XMIT and adjust the associated receiver and sound sys-

tem level as required. Note: There will be a delay between the moment the transmitter is energized and the actual appearance of audio at the receiver output. This intentional delay eliminates turn-on thumps, and is controlled by the pilot tone squelch system. The input limiter will handle peaks over 15 dB above full modulation, regardless of the gain control setting. Oc-

casional limiting is often deemed desirable, indicating that the gain is correctly set and the transmitter is fully modulated for optimum signal to noise ratio. Different voices will usually require different audio input gain settings, so check this adjustment as each new person uses the system. If several different people will be using the transmitter and there is not time to make the adjust-

ment for each individual, adjust it for the loudest voice. 2) Set the MODE switches on the rear panel to match the specific input source to be used. (See MODE Switches.) Insert the power supply plug into the 6-18 VDC jack on the rear panel. 3) Operating Notes The AUDIO LEVEL control should not be used to control the volume of the associated receiver. This gain adjustment is used to match the IFBT4 input level to the incoming signal from the sound source to provide full modulation and maximum dynamic range, not to set the volume of the associated receiver. If the audio level is too high the audio metering will exceed the 0 dB level too frequently. This condi-

tion may reduce the dynamic range of the audio signal. If the audio level is too low the audio metering will be too far below the 0 dB level. This condition may cause hiss and noise in the audio, or pumping and breathing in the background noise. 10 IFBT4LECTROSONICS, INC. DCR12/A5U ARG15 ARG25 ARG50 ARG100 Accessories DCR12/A5U AC power supply for IFBT4 transmitters; 100-240 V, 50/60 Hz, 0.3 A input, 12 VDC regulated output;

7-foot cord with LZR threaded locking plug and in-

terchangeable blades/posts for use in Europe, UK, Australia and USA (sold separately). SNA600 Collapsible dipole antenna that adjusts over a wide frequency range. Ideal for situations where a full 360 degree receiving pattern is required as op-

posed to a directional pattern. ALP Series Antennas ALP500, ALP620 & ALP650 Shark Fin style Log Periodic Dipole Array (LPDA) Antennas that provide a useful directional pattern over a broad frequency bandwidth. Ideal for portable applications including temporary setups for field production. ALPKIT Stainless steel kit for mounting SNA600 and ALP Series antennas on photo and video tripods, light-

ing equipment, and standard microphone stands. ARG15 A 15 foot antenna cable of standard RG-58 coax cable with BNC connectors at each end. Loss of 1 to 2 dB with 0.25 diameter. ARG25/ARG50/ARG100 An antenna cable of Belden 9913F low-loss coax cable with BNC connectors at each end. Double shielded, flexible, 50 Ohms, with a foamed poly-

ethylene dielectric. Lower loss (1.6 to 2.3 dB) with somewhat less weight than standard RG-8 with the same 0.400 diameter. Available in 25, 50 and 100 foot lengths. RMP195 4 channel rack mount for up to four IFBT4 transmitters. Rocker switch included to work as a master power switch if desired. 21425 6 ft. long power cord; coaxial to stripped & tinned leads. Coaxial plug: ID-.080; OD-.218; Depth- .5. Fits all compact receiver models that use CH12 power supply. 21472 6 ft. long power cord; coaxial to stripped & tinned leads. Right angle coaxial plug: ID-.075; OD-.218;

Depth- .375. Fits all compact receiver models that use CH12 power supply. 21586 DC16A Pigtail power cable, LZR stripped & tinned. 4 7 5 O . D . Locking collar with 5/16-32 thread SNA600 RMP195

.475

.375

. 3 7 5 O . D . 35

. 3 7 5 O . D . 21425 21472 21586 Locking collar with 5/16-32 thread

. 4 7 5 O . D . 11 Multi-Frequency IFB TransmitterRio Rancho, NM Troubleshooting NOTE: Always ensure that the COMPAT (compatibility) setting is the same on both transmitter and receiver. A variety of different symptoms will occur if the settings do not match. With the IFBR1a receiver no sound will be heard unless the transmitter is set to the IFB mode. When used with receivers other than the IFBR1a, a variety of symptoms will occur when the COMPAT settings do not match, ranging from no sound, to level inconsistencies, to distortion of various degrees. See the section entitled Front Panel Controls and Functions for details on the available compatibility modes and how to select them. Possible Cause:

1) External power supply disconnected or inadequate. 2) The External DC power input is protected by an auto-reset polyfuse. Disconnect power and wait about 1 minute for the fuse to reset. Symptom:

Display Dead No Transmitter Modulation 1) Audio input gain setting turned all the way down. 2) Sound source off or malfunctioning. 3) Input cable damaged or mis-wired. No Received Signal

(The IFBR1/IFBR1a headset cable is the antenna.) 1) Transmitter not turned on. 2) Receiver antenna missing or improperly positioned. 3) Transmitter and receiver not on same frequency. Check on transmitter and receiver. 4) Operating range is too great. 5) Transmitter antenna not connected. 6) Transmitter switch in the TUNE position. Switch to XMIT mode. No Sound (or Low Sound Level), and Receiver is powered on. 1) Receiver output level set too low. 2) Receiver earphone cable is defective or mis-wired. 3) Sound system or transmitter input is turned down. Distorted Sound 1) Transmitter gain (audio level) is far too high. Check audio level meter on transmitter as it is being used. (Refer to Installation &

Operation section for details on gain adjustment.) 2) Receiver output may be mismatched with the headset or earphone. 3) Excessive wind noise or breath pops. Reposition microphone Adjust output level on receiver to the correct level for the headset or earphone. and/or use a larger windscreen. Hiss, Noise, or Audible Dropouts

(The IFBR1/IFBR1a headset cable is the antenna.) 1) Transmitter gain (audio level) far too low. 2) Receiver antenna missing or obstructed. 3) Transmitter antenna missing or mismatched. Check that the correct antenna is being used. 4) Operating range too great. 5) Defective remote antenna or cable. Antenna Icon (in Main Window) or Hex Code (in Frequency Window ) Blinking required if problem persists. 1) PLL is unlocked. Retune transmitter. Factory service may be 12 IFBT4LECTROSONICS, INC. Frequency Blocks and Ranges The table below lists the factory designated frequency ranges available for the IFBT4 Transmitter. Each IFBT4 transmitter is built to cover a pre-selected range of frequencies (a block) as shown below. The transmitter will tune to any of 256 different frequencies within this factory assigned block (except blocks 23 and 944). The block number is determined by this formula:

25.6 Block = Lowest frequency (MHz) in the block To determine a block number from a frequency:

Freq. (MHz) divided by 25.6 = Block number It is handy to remember these formulas, in case you do not have a copy of the table. For example, suppose you need to know which block covers 685.500 MHz, which is in the middle of the Block 26 frequency range. 685.500 divided by 25.6 = 26.77734375 The first two digits left of the decimal are the block number. In this case, 685.500 MHz falls within block 26. UHF Transmitter Antenna Specifications Block 944 is an exception to this block numbering sys-

tem and depicts the actual frequency of the block since it is a special case in an 8 mHz band with 78 frequency channels. The IFB transmitter antennas are color coded to indi-

cate the frequency block that they operate within. The length of the antenna varies with the frequency block. The actual length of the antenna is not as critical as it might appear in the table below. The usable band-

width of the detachable antenna is +/- 50 MHz from the blocks center frequency, so it is acceptable to use an antenna from an adjacent block above or below the operating frequency if some loss in range can be toler-

ated. Part of block 23 is not used since it covers a 608 to 614 MHz band that is allocated exclusively for use in radio astronomy. Note: Check the scale of your printout. This line should be 6.00 inches long (152.4 mm). 3 3 1 3 4 4 9 2 3 0 3 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 2 9 1 0 7 4 Measure from this edge of the housing Lectrosonics A500RA UHF transmitter antennas follow the color code specifications in this chart to identify operat-

ing frequency block range.

(The frequency block range is engraved on the outside housing for each individual transmitter.) If a situation exists whereby the antenna is defective and the antenna cap is missing, refer to this chart to determine the correct replacement antenna. BLOCK FREQUENCY RANGE CAP COLOR ANTENNA LENGTH 470 19 20 21 22 23 944 470.100 - 495.600 486.400 - 511.900 512.000 - 537.500 537.600 - 563.100 563.200 - 588.700 588.800 - 607.900 944.100 - 951.900 Black w/ Label Black w/ Label Black w/ Label Brown Red Orange Black w/ Label 4.73 4.51 4.05 3.80 3.48 3.36 1.57 13 Multi-Frequency IFB TransmitterRio Rancho, NM Specifications Operating Frequencies (MHz):

Block 470 470.100 - 495.600 486.400 - 511.900 Block 19 Block 20 512.000 - 537.500 537.600 - 563.100 Block 21 563.200 - 588.700 Block 22 Block 23 588.800 - 607.900 Block 944 944.100 951.900 100 kHz 250 mW 25 to 32 kHz; 3.5 kHz deviation

(in Nu Hybrid mode) Compliant with ETSI EN 300 422-1 v1.4.2

.001% (10 ppm) @ 25 C Channel Spacing:

RF Power Output:

Pilot tone:

Spurious Radiation:

Frequency Stability:

Temperature Stability: .001% (10 ppm) from -30 C to +50 C Channel Selection:

Compatibility Modes Mode 3, IFB and Nu Hybrid Audio Frequency Response:

Rolloff:

Signal to Noise Ratio:

Momentary pushbutton switches, TUNE Up and Down 100 Hz to 8 kHz, 1 dB, IFB mode system response (see Rolloff) 30 Hz to 20 kHz, 1 dB, Nu Hybrid mode system response Low frequency audio rolloff is Menu selectable for 3 dB down at 35 Hz or 50 Hz. 90 dB typical (A weighted) 50 ohms 0 dBu for Line, RTS1 & RTS2

-10 dBu for Clear Com

-42 dBu for mic dry inputs (no phantom power)

+/-50Vdc max Balanced and Unbalanced, rear panel selectable for Line, Mic. RTS 1, RTS 2, and Clear Comm Output Impedance:

Audio Input Levels:

Audio Input Config:

Audio Input Impedance: Greater than 2 K balanced, greater than 1 K unbalanced Gain Control Range:

Audio Input Jack:

Input Power:

Power Input Jack:

Indicators:

Front panel controls:

Rear panel controls:

Weight:

Size:

Emission designator:

at any gain setting

-18 dB to +24 dB (0 dB nominal center), Menu selectable Standard XLR female connector 12 to 14 VDC typical, 200 ma. max.; Max. Input Range 6 to 18 VDC Coax type, locking LZR RL26AE Backlit Liquid Crystal Display. Displays modulation meter, frequencies, modes, rolloff, audio level, and tuning groups. MENU momentary pushbutton switch Power OFF-TUNE-XMIT, 3 position slide switch Select UP momentary pushbutton switch Select DOWN momentary pushbutton switch Input Mode Select, 4 section DIP switch 9.6 ozs. (272 grams) 5.25 L (including connectors) x 3.25 W x 1.25 H 133.35 L (including connectors) x 82.55 W x 31.75 H mm 110KF3E Specifications subject to change without notice. This device complies with FCC radiation exposure limits as set forth for an uncontrolled environment. This device should be installed and operated so that its antenna(s) are not co-located or operating in conjunction with any other antenna or transmitter. A separation distance of at least 20cm (8 inches) must be maintained to comply with the FCC Radio Frequency Maximum Permissible Exposure (MPE) requirements. 14 IFBT4LECTROSONICS, INC. Service and Repair If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnect-

ing cables and then go through the Troubleshooting section in this manual. We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose connec-

tion, send the unit to the factory for repair and service. Dont attempt to adjust any controls inside the units. Once set at the factory, the various controls and trimmers do not drift with age or vibration and never require readjustment. There are no adjustments inside that will make a malfunctioning unit start working. LECTROSONICS Service Department is equipped and staffed to quickly repair your equipment. In warranty repairs are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a modest flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone for out-of-warranty repairs. Returning Units for Repair For timely service, please follow the steps below:

A. DO NOT return equipment to the factory for repair without first contacting us by email or by phone. We need to know the nature of the problem, the model number and the serial number of the equipment. We also need a phone number where you can be reached 8 A.M. to 4 P.M. (U.S. Mountain Standard Time). B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed your repair through our receiving and repair departments. The return authorization number must be clearly shown on the outside of the shipping container. C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the proper packing materials. UPS is usually the best way to ship the units. Heavy units should be double-boxed for safe transport. D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or dam-

age to equipment that you ship. Of course, we insure the equipment when we ship it back to you. Lectrosonics USA:

Mailing address:

Lectrosonics, Inc. PO Box 15900 Rio Rancho, NM 87174 USA Web:

www.lectrosonics.com Lectrosonics Canada:

Mailing Address:

720 Spadina Avenue, Suite 600 Toronto, Ontario M5S 2T9 Shipping address:

Lectrosonics, Inc. 561 Laser Rd. NE, Suite 102 Rio Rancho, NM 87124 USA Telephone:

(505) 892-4501

(800) 821-1121 Toll-free

(505) 892-6243 Fax E-mail:

sales@lectrosonics.com Telephone:

(416) 596-2202

(877) 753-2876 Toll-free

(877-7LECTRO)

(416) 596-6648 Fax E-mail:

Sales:

Service: joeb@lectrosonics.com colinb@lectrosonics.com 15 Multi-Frequency IFB TransmitterRio Rancho, NM LIMITED ONE YEAR WARRANTY The equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping. This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot correct the defect in your equipment, it will be replaced at no charge with a similar new item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you. This warranty applies only to items returned to Lectrosonics, Inc. or an authorized dealer, shipping costs prepaid, within one year from the date of purchase. This Limited Warranty is governed by the laws of the State of New Mexico. It states the entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL, OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE EQUIPMENT. This warranty gives you specific legal rights. You may have additional legal rights which vary from state to state. 581 Laser Road NE Rio Rancho, NM 87124 USA www.lectrosonics.com

+1(505) 892-4501 fax +1(505) 892-6243 (800) 821-1121 US and Canada sales@lectrosonics.com 7 November 2018