Product manual

Appendix D: Setting Model 6 and Model 26 Audio Levels
120 025-9158L
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):
• 2-wire = turn R135 counterclockwise, reduce it to 1.0 Vp-p (0.35 Vrms)
• 4-wire = turn R107 counterclockwise, reduce it 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.
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 Station PA
System on page 121 .
Model 6 FFSK Transmit Level
Set the Model 6 Transmit level by performing the following steps. The jumpers on the
Model 6 should be verified initially, prior to setting up the system. See
Table 8 for initial
jumper settings. See
Table 9 for pot descriptions. See Figure 29 for locations.
♦
Setting the Model 6 FFSK transmit level:
1. At the Model 26 location, attach an oscilloscope to monitor the incoming signal
level from the wire-line.
• 2-wire = J14 pins 9 (AUD+) and 10 (AUD-)
• 4-wire = J13 pins 3 (AUD+) and 4 (AUD-)
2. At the Model 6, connect the laptop (or PC) to the serial programming port of the
Model 6. Move switch SW1-8 on the transponder motherboard to the ON
position. Hit the SPACE bar three times to open the Model 6 Main menu.
3. Enter an “8” to start the FFSK LEVEL SET test tone sequence. The Model 6
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, enter an
“8” again.
4. While the FFSK test tone is being transmitted by the Model 6, adjust the R108
pot (FFSK OUT) on the motherboard of the Model 6 for a level of 1.0 Vp-p
(0.35 Vrms) is measured at the FFSK test point (TP6) on the back of the Model
26. If the signal cannot be set low enough, move JP5 in the Model 6 from
position TEL to RAD. If the signal cannot be set high enough, move JP5 from
position TEL to PWR.
5. When finished making adjustments, let the test signal time-out or stop the test.