This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must except any interference received, including interference that may cause undesired operation. SAFETY TRAINING INFORMATION Your SYD, KYD radio generates RF electromagnetic en-ergy during transmit mode. This radio is designed for and classified as Occupational Use Only, meaning it must be used only during the course of employment by individuals aware of the hazards, Warning not intended for use by the General Population in an and the ways to minimize such hazards. This radio is uncontrolled environment. This radio has been tested and complies with the FCC RF exposure limits for Occupational Use Only. In addition, your SYD, KYD radio complies with the following Standards and Guidelines with regard to RF energy and electromagnetic energy levels and evaluation of such levels for exposure to humans:
FCC OET Bulletin 65 Edition 97-01 Supplement C, Evaluating Compliance with FCC Guidelines for Human Exposure to Radio Frequency Electromagnetic Fields. American National Standards Institute (C95.11992), IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. American National Standards Institute (C95.31992), IEEE Recommended Practice for the Measurement of Potential y Hazardous Electromagnetic Fields RF and Microwave. To ensure that your exposure to RF electromagnetic energy is within the FCC allowable limits for occupational use, always adhere to the following CAUTION guidelines:
DO NOT operate the radio without a proper antenna attached, as this may damage the radio and may also cause you to exceed FCC RF exposure limits. A proper antenna is the antenna supplied with this radio by the manufacturer or an antenna specically authorized by the manufacturer for use with this radio. DO NOT transmit for more than 50% of total radio use time (50% duty cycle). Transmitting more than 50% of the time can cause FCC RF exposure compliance requirements to be exceeded. The radio is transmitting when the TX indicator lights red. You can cause the radio to transmit by pressing the PTT switch. ALWAYS use SYD, KYD authorized accessories (antennas, batteries, belt clips, speaker/mics, etc). Use of unauthorized accessories can cause the FCC RF exposure compliance requirements to be exceeded. Body-worn operations are restricted to belt-clips, holsters or similar accessories that have no metallic component in the assembly and that provide at least 1.5 cm separation between the device, including its antenna, and the user's body. To provide the recipients of your transmission the best sound quality, hold the antenna at least 5 cm (2 inches) from mouth, and slightly off to one side. The information listed above provides the user with the information needed to make him or her aware of RF exposure, and what to do to assure that this radio operates within the FCC RF exposure limits of this radio. Electromagnetic Interference/Compatibility During transmissions, your SYD, KYD radio generates RF energy that can possibly cause interference with other devices or systems. To avoid such interference, turn off the radio in areas where signs are posted to do so. DO NOT operate the transmitter in areas that are sensitive to electromagnetic radiation such as hospitals, aircraft, and blasting sites. FOREWORD Thank you for purchasing the TD-790 transceiver. READ ALL INSTRUCTIONS carefully and completely before using the transceiver. SAVE THIS INSTRUCTION MANUALThis instruction manual contains important operating instructions for the transceiver. INSTALLATION NOTES Body-worn operations are restricted to belt-clips, holsters or similar accessories that have no metallic component in the assembly and that provide at least 1.5 cm separation between the device, including its antenna, and the user's body If you wear a portable two-way radio on your body, ensure that the antenna is at least 2.5 centimeters (1 in.) from your body when transmitting. IMPORTANT RF CAUTION! NEVER hold the transceiver so that the antenna is very close to, or touching exposed parts of the body, especially the face or eyes, while transmitting. The transceiver will perform best if the microphone is 2 to 4 in. (5 to 10 cm) away from the lips and the transceiver is vertical. RF CAUTION! NEVER operate the transceiver with a headset or other audio accessories at high volume levels. RF CAUTION! NEVER short the terminals of the battery pack. DO NOT push the PTT when not actually desiring to transmit. AVOID using or placing the transceiver in direct sunlight or in areas with temperatures below +14F (10C) or above +122F (+50C). The basic operations, transmission and reception of the transceiver, are guaranteed within the specified operating temperature range (depending on version). However, the LCD display may not be operate correctly, or show an indication in the case of long hours of operation, or after being placed in extremely cold areas. DO NOT modify the transceiver for any reason. KEEP the transceiver from the heavy rain, and never immerse it in the water. The transceiver construction is water resistant, not waterproof. The use of non SYD, KYD battery packs/chargers may impair transceiver performance and invalidate the warranty. PORTABLE FM TRANSIVER SYD TECHNICAL TD-790
1 GENERAL/ INTRODUCTION SCOPE OF THIS MANUAL This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment. It contains all required service information for the equipment and is current as of the publication date.Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions. These are issued as required. ORDERING REPLACEMENT PARTS When ordering replacement parts or equipment information, the full part identification number should be included.This applies to all parts: components, kits, or chassis. If the part number is not known, include the chassis or kit number of which it is a part, and a sufficient description of the required component for proper identification. PERSONAL SAFETY The following precautions are recommended for personal safety:
DO NOT transmit until all RF connectors are verified secure and any open connectors are properly terminated. SHUT OFF and DO NOT operate this equipment near electrical
blasting caps or in an explosive
This equipment should be serviced by a qualified technician only.
SERVICE This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and alignment procedures contained within.
Number of channels 199 RF Power Output 5W
199
5W
REALIGNMENT
/ GETTING ACQUAINTED
. 3 4 MODES
USER MODE PC MODE
PC MODES User mode PC mode FUNCTION For normal use. Used for communication between the radio and a PC How to enter each mode MODES User mode PC mode
PROCEDURE Power ON
Receiver commands from PC
Used for communication between the radio and a PC
PC MODE Preface The TD-790 transceiver can be programmed using a personal computer, A programming interface cable and programming The programming software can be used on an IBM software. PC or compatible. Fig-1 shows the setup of a PC for programming.
Caution:
When removing or installing the programming cable,first switch off the radio power. Additionally, be sure to disable the VOX function, if its enabled, as it can sometimes activate from connection noise. Connection procedure 1. Connect the TD-790 to the personal Computer using the interface cable. 2. When the POWER is switched ON, you can enter user mode.
Programming software description The software allows a user to program the TD-790 radios via the programming interface cable.
Programming with IBM PC If data is transferred to the transceiver from a PC with the software, the destination data (basic radio information) for each set can be modified.
5 DISASSEMBLY FOR REPAIR/ Separating the case assembly from the chassis 1. Remove the knob 1 and two round nuts 2 2. Remove the two screws 3. 3. Expand the right and left sides of the bottom remove of the case assembly, lift the chassis,and it from the case assembly 4.
2
1 3
4
4. Taking care not to cut the speaker lead 5, open the chassis and case assembly.
5
6
Separating the chassis from the unit Remove the five screws 6 and drop-out line, the first unit off. and lift 6
7
8
9 Remove the six screws 7. Remove the solder from the antenna terminal using a soldering iron them lift the second Note: When reassembling the unit in the chassis, be unit off 8. sure to solder the antenna terminal. Removing the lever Raise the lever on the lower case 9, insert a small flat screwdriver into the space between and lever, open the case carefully 10 and lift the lever off. Note.: Do not force to separate the case from the lever. the case 7