User Manual

TR-800 Service Manual
-36-
1. Adjust the frequency of the communication test set or generator to that of receive.
2. Place the main radio on the receive frequency mode defined in Step 1 under
“Programming the Radios”.
3. Adjust the level of the communication test set or generator until the main radio emits a
weak signal.
4. Increase the level of the communication test set or generator by approximately 20dB.
5. Adjust the tuning screw of the duplexer for the greatest rejection of the signal. This will
appear as a noisier signal. If necessary:
5A. Slightly loosen the locking nuts of the tuning screws to allow the tuning screws to turn more
freely (but not “sloppy”) and
5B. Increase the level of the communication test set or generator to maintain an audible 1kHz
tone.
6. Repeat steps Step 4, Step 5, Step 5A and Step 5B for each of the tuning screws on the
duplexer. Begin with the tuning screw closest to the antenna port and move in order toward
the tuning screw closest to the main radio port.
7. Tighten the locking nuts of the tuning screws.
To avoid damage to the tuning screws and to allow fine tuning of the duplexer, do not over
tighten the locking nuts.
8. Repeat Step 5, Step 5A and Step 5B to fine-tune the main radio section of the duplexer.
Tuning the Slave Radio Section
Tuning the slave radio section of the duplexer begins with the tuning screw closest to the antenna
port of the duplexer.
9. Adjust the frequency of the communication test set or generator to that of transmit.
10. Place the slave radio on the receive frequency mode defined in Step 2 under “Programming
the Radios”.
11. Adjust the level of the communication test set or generator until the slave radio emits a
weak signal.
12. Increase the level of the communication test set or generator by approximately 20dB.
13. Adjust the tuning screw of the duplexer for the greatest rejection of the signal. This will
appear as a noisier signal. If necessary:
13A. Slightly loosen the locking nuts of the tuning screws to allow the tuning screws to turn
more freely (but not “sloppy”) and
13B. Increase the level of the communication test set or generator to maintain an audible 1kHz
tone.
14. Repeat steps Step 12, Step 13, Step 13A and Step 13B for each of the tuning screws on the
duplexer. Begin with the tuning screw closest to the antenna port and move in order toward
the tuning screw closest to the slave radio port.
15. Tighten the locking nuts of the tuning screws.
To avoid damage to the tuning screws and to allow fine tuning of the duplexer, do not over
tighten the locking nuts.
16. Repeat Step 13, Step 13A and Step 13B to fine-tune the slave radio section of the duplexer.