Radio Alignment Procedures
27
Transmit
Deviation Limit
Alignment
This alignment procedure limits the modulation of a baseband signal. It is used for primary
modulation limiting.
This procedure needs to be performed at multiple frequencies to allow for proper alignment
across the entire RF band. The RF band is divided into frequency zones with a calibration
point (value) in each zone.
NOTE: This alignment is required after replacing (or servicing) the VOCON
board or the transceiver board.
1. Select the TX Deviation Limit alignment screen. The screen will indicate the
transmit frequencies to be used. See Figure 11.
2. Left-click the desired frequency field (starting with the highest frequency shown).
3. Left-click the PTT Toggle button on the screen to make the radio transmit. The screen
indicates whether the radio is transmitting.
4. Measure the transmitted signal deviation of the radio with a service monitor.
5. Adjust softpot value until the measured deviation is as close as possible to 2.83 kHz.
6. Repeat the above process for all frequencies.
7. Left-click the Program All button on the screen to dekey the radio and save the tuned
values.
Figure 11. Transmit Deviation Limit Alignment Screen
To Next Page
Loading...
