Motorola APX 1000 Basic Service Manual page 417

Radio Alignment Procedures: Transmitter Alignments
- In the "RF Control" section of the R-2670, move the cursor to the "B/W" setting and select
"WIDE +/- 100 kHz" on 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."
2. Initial setup using the 8901_ Series Modulation Analyzer:
- Press the FM MEASUREMENT button. (The "Error 0input 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 key.
3. Select the TX Deviation Balance alignment screen. The screen indicates the transmit
frequencies to be used. See
4. In the "RF Control" section of the R2670, set the service Monitor to the desired frequency (as
shown in the frequency list in the TX Deviation Balance alignment screen).
5. Left-click the PTT Tone: Low button.
6. Left-click the slider of the frequency selected (should be the same frequency as step 4).
7. Left-click the PTT Toggle button on the screen to make the radio transmit. The screen
indicates whether the radio is transmitting.
8. Measure and Record the Low Tone Tx Deviation value from the 8901_ Series Analyzer or the
AC voltage value from the R2670.
9. Left-click the PTT Tone: High button.
10. Adjust the softpot value until the measured deviation/voltage, when using the high tone, is
within +/- 1.5% of the value observed when using the Low Tone.
11. Left-click the PTT Toggle to de-key the radio.
12. Repeat the steps 4 to 10 for all frequencies.
13. Left-click the Program All button on the screen to dekey the radio and save the tuned values.
Figure 6-21, Figure 6-22, Figure 6-23 and Figure
6-17
6-24.