Product manual

Appendix D: Setting Model 6 and Model 26 Audio Levels
112 025-9158L
Figure 27: Model 26 Jumper Locations
JP11
JP12
JP6
JP1
JP7
JP2
JP8
JP9
JP3
JP10
JP4 JP5
♦ Setting the Model 26 FFSK transmit level:
1. At the Model 26, connect the laptop (or PC) to the serial programming port of the
Model 26. Set Switch 7 on the rear of the Model 26 to the ON position (places
the unit in the programming mode). Hit the SPACE bar three times to open the
Model 26 Main menu.
2. Enter a “7” to open the FFSK Test Menu.
3. 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.
4. While the FFSK test tone is being transmitted by the Model 26, use the service
monitor to measure the deviation of its radio transmitter. Adjust the FSK XMIT
pot (R79) on the back of the Model 26 for a deviation of 2.5 kHz (assuming wide
band and a full channel deviation of 5 kHz). If the signal cannot be set low
enough, move JP10 in the Model 26 from position B to C. If the signal cannot be
set high enough, move JP10 from position B to A.
5. When finished making adjustments, let the test signal time-out or stop the test.
6. Leave the laptop attached to the Model 26 and leave it in the FFSK Test menu for
now.