Transmit Deviation Limit Alignment; Figure 6-7. Transmit Deviation Balance (Compensation) Alignment Screen - Motorola ASTRO SPECTRA Service Manual

6-8
MOTOROLA Radio Service Software
ASTRO
MAIN:SERVICE:TX ALIGN:BAL ATTN
MIN |----+----+----+----X----+----+---+----+----+----+----+----| MAX
F1
HELP

Figure 6-7. Transmit Deviation Balance (Compensation) Alignment Screen

5. Press Tab to select and start the alignment at the lowest frequency listed.
6. Press F3 (TOGGLE LOW TONE PTT) to key the radio. Wait approximately five seconds until
the frequency displayed on the analyzer stabilizes.
7. Measure and record the deviation value from the 8901_ analyzer or the ac voltage value from
the R-2670 analyzer.
8. Press F3 to dekey the radio.
9. Press F6 (TOGGLE HIGH TONE PTT) to key the radio. Wait approximately 5 seconds until
the voltage shown on R-2670 analyzer, or the deviation shown on the 8901_ analyzer,
stabilizes.
10. Use the Up and Down arrow keys on the computer keyboard to adjust the deviation to within
±1.5%) of the value recorded in step 6.
11. Press F6 to dekey the radio, and then press F6 again to verify the deviation setting.
12. Press F8 to program the new softpot value.
13. Repeat steps 4 through 10 to ensure the correct deviation balance value has been saved.
14. Repeat steps 4 through 11 for each of the remaining frequencies.
15. Press F10 once to return to the TRANSMITTER ALIGNMENT MENU, or press F10 twice to
return to the SERVICE MENU.
6.2.7

Transmit Deviation Limit Alignment

This test can be done with either the R-2670 communication analyzer or the 8901_ Series
Modulation Analyzer. The R-2670 is recommended.
1. Initial set up using the R-2670 Communication Analyzer:
- Connect a BNC cable between the "DEMOD OUT" port and the "VERT/SINAD DIST/DMM
COUNTER IN" port of 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.
February 3, 2003
Model: T04SLF9PW7AN
TRANSMIT DEVIATION BALANCE (COMPENSATION)
-----------------------------------------
Current
Frequency Value
--------- -------
806.0125 30
821.0125 30
851.0125 30
866.0125 45
869.9875 45
Transmitter..Off
0
F2 F3 F4
TOGGLE LOW
TONE PTT
Use UP/DOWN Arrows To Adjust Softpot.
New Softpot Value
-----------------
30
30
30
45
45
F5 F6 F7 F8
TOGGLE HIGH PROGRAM
TONE PTT VALUE
Radio Alignment Procedure: RSS
63
F9 F10
EXIT
6881076C20-E