Specifications

Appendix C: Using a Model 620x in a Model 26-based System
184 025-9581M
c. Enter a “1” to initiate the FFSK test mode. The Model 26 should key its radio
and transmit for 30 seconds and then unkey. If you finish making adjustments
before 30 seconds is up, you can cancel the test by hitting any character key on
the computer keyboard. If you require more time to make the adjustments,
enter the “1” again to repeat the test tone.
5. If the voltage measured at TP-1, while the test signal is being received, is less than
1.0 Vp-p (0.35 Vrms), turn R62 clockwise until it reaches 1.0 Vp-p.
6. If the voltage measured at TP-1, while the test signal is being received, is greater
than 1.0 Vp-p (0.35 Vrms), turn R107 counterclockwise until it is reduced to 1.0
Vp-p (0.35 Vrms).
7. When finished making adjustments, let the test signal time-out or stop the test. If
this is the last transponder you are setting the receive level on, you may exit the test
and serial programming mode at the Model 26 and disconnect the laptop. Return
the Model 26 to normal operation.
♦ Setting the Model 6203 transmit level:
1. At the Model 6203, connect the laptop (or PC) to the serial programming port of
the Model 6203. Move switch SW1-8 on the transponder motherboard to the ON
position. Hit the SPACE bar three times to open the Model 6203 Main menu.
2. Enter an “8” to start the {8} FFSK LEVEL SET test tone sequence. The Model
6203 should key its radio and transmit for 30 seconds and then unkey. If you finish
making before 30 seconds is up, you can cancel the test by hitting any character
key on the computer keyboard. If you require more time, enter an “8” again.
3. While the FFSK test tone is being transmitted by the Model 6203, use the service
monitor to measure the deviation of its radio transmitter. Adjust the R108 pot
(FFSK OUT) on the motherboard of the Model 6203 for a deviation of 2.5 kHz
(assuming wide band operation and a full channel deviation of 5 kHz). If the signal
cannot be set low enough, move JP5 in the Model 6203 from position TEL to
RAD. If the signal cannot be set high enough, move JP5 from position TEL to
PWR.
4. When finished making adjustments, let the test signal time-out or stop the test.
5. Enter the letter “e” as many times as necessary to exit the programming mode.
Move switch SW1-8 on the transponder motherboard to the OFF position.
Remove the serial cable from the transponder.
Once the level setting procedure has been completed and both the transponder and the
Model 26 returned to the normal operating mode. The Model 26 should soon
communicate with the new transponder and display its current status.
Note This procedure only sets the FFSK levels. For information on setting
the final voice audio output level to the station PA system, see
Setting Voice Audio Output Level to the Station PA System on page
186.