Transmit Deviation Limit Alignment; Figure 11. Transmit Deviation Limit Alignment Screen - Motorola ASTRO XTSTM 2500 Basic Service Manual

Radio Alignment Procedures
Transmit
Deviation Limit
Alignment
30
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.

Figure 11. Transmit Deviation Limit Alignment Screen

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.