Figure 6-8. Transmit Deviation Limit Alignment Screen - Motorola ASTRO SPECTRA Service Manual

Radio Alignment Procedure: RSS
- 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 LIMIT screen 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. Move the cursor to the "Meter" setting and
select "AC VOLTS" via the soft key menu. Move the cursor to the "Range" setting and
select "AUTO."
2. Initial set up using the 8901_ Series Modulation Analyzer:
- Press the FM MEASUREMENT button. (The "Error 03-input level too low" indication is
normal until an input signal is applied.)
- Simultaneously press the Peak – and Peak + buttons. Both LEDs on the buttons should
light.
- Press the 15 kHz LP filter button.
3. From the SERVICE MENU, press F2 to select the TRANSMITTER ALIGNMENT MENU.
4. Press F6 to select the TRANSMIT DEVIATION LIMIT alignment screen (
MOTOROLA Radio Service Software
ASTRO Mobile Model: T04SLF9PW7AN
MAIN:SERVICE:TX ALIGN:DEVIATION
MIN |----+----+----+----X----+----+----+----+----+----+----+----| MAX
F1
HELP
5. Press Tab to select and start the alignment at the lowest frequency listed.
6. Press F6 and observe the measurement.
7. Wait approximately 5 seconds until the voltage shown on the R-2670 analyzer, or the
deviation shown on the 8901_ analyzer, stabilizes.
8. Adjust the deviation limit to within 0.158 to 0.163 Vac on the R-2670 analyzer, or 2.785 to
2.885 kHz on the 8901_ analyzer. The optimum setting is 0.160 Vac (2.83 kHz).
9. Press F6 again to dekey the radio.
10. Press F8 to program the new softpot value.
11. Repeat steps 4 through 7 to ensure the correct deviation limit is saved.
12. Repeat steps 3 through 7 for each of the remaining frequencies.
13. If the transmit limit adjustment required was excessive, repeat or recheck the transmit
deviation balance (compensation) procedure on page 6-7.
14. Press F10 once to return to the TRANSMITTER ALIGNMENT MENU, or press F10 twice to
return to the SERVICE MENU.
6881076C20-E
TRANSMIT DEVIATION LIMIT
------------------------
Current
Frequency Value
--------- ---------
813.4750 11750
822.4750 11750
858.4750 11800
867.9750 11800
Transmitter..Off
0
F2 F3 F4

Figure 6-8. Transmit Deviation Limit Alignment Screen

Use UP/DOWN Arrows To Adjust Softpot.
New Softpot Value
------------------
11750
11750
11800
11800
F5 F6 F7 F8
TOGGLE PROGRAM
PTT VALUE
Figure 6-8 ).
32767
F9 F10
EXIT
February 3, 2003
6-9