Transmit Deviation Balance (Compensation) Alignment - Motorola ASTRO XTS 3000 Service Manual

Transmit Deviation Balance (Compensation) Alignment

Use the following CPS procedure when applicable.
Procedure 7-6 CPS Procedure
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7.4 Transmit Deviation Balance (Compensation) Alignment
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This test can be done with either the R–2670 Communication Analyzer or the 8900 series
Modulation Analyzer. The instrument of choice is the R2670 analyzer.
Use the following procedure for initial setup using an R–2670 Communication Analyzer.
Procedure 7-7 Initial Setup Using the R–2670 Communication Analyzer
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Under the Transmitter Alignments menu, select TX Power High. The screen
will indicate the transmit frequencies to be used.
Select a frequency field (starting with the highest frequency shown) and select
the PTT button to key the radio.
Select the Up/Down arrow keys under New Softpot Value window to adjust the
transmit power per the values specified in the specifications.
Select the PTT button again to dekey the radio.
Select Program button to program the softpot value.
Repeat steps 2-5 for the remaining frequencies.
Select the Close button to return to the Transmitter Alignments menu.
Repeat steps 1-7 for the remaining Transmit Power Levels.
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Connect a BNC cable between the "DEMOD OUT" port and the "VERT/SINAD
DIST/DMM COUNTER IN" port on the R-2670.
Press the SPF key on the R-2670 to display the SPECIAL FUNCTIONS menu.
Move the cursor to High Pass, and select 5 Hz via the soft key menu. Select 20
kHz for the Low Pass setting.
In the RF Control section of the R-2670 enter the frequency displayed on the
RSS screen (choose a test frequency from the list of frequencies displayed under
Transmit Deviation balance (Compensation) in RSS). Move the cursor to the
B/W setting and select WIDE +/- 100 kHz via the soft key menu.
Place the R-2670 cursor in the Display zone. Select AC VOLTS on the soft key
menu. Move the cursor to the Range setting and select AUTO.
Continue with RSS or CPS procedure listed below.
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Chapter 7: ALIGNMENT PROCEDURE
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68P81083C85-A March 2004