Radio Information; Reference Oscillator Alignment; Figure 7. Radio Information Screen - Motorola ASTRO XTSTM 2500 Basic Service Manual

Radio Alignment Procedures
Radio
Information
Reference
Oscillator
Alignment
24
Figure 7 shows a typical Radio Information screen.

Figure 7. Radio Information Screen

Adjustment of the reference oscillator is critical for proper radio operation. Improper
adjustment will result not only in poor operation, but also in a misaligned radio that
will interfere with other users operating on adjacent channels. For this reason, the
reference oscillator should be checked every time the radio is serviced, or once a
year, whichever comes first. The frequency counter used for this procedure must
have a stability of 0.1 ppm (or better).
NOTE: Reference oscillator alignment is required after replacing (or
servicing) the transceiver board.
This test can be done with either the R-2670 Communication Analyzer or the
8901_Modulation Analyzer.
• Initial setup using the R-2670 Communication Analyzer:
- RF Control: MONITOR
- B/W: WB
- Freq: CPS frequency under test
- Attenuation: 20dB
- Mon RF in: RF I/O
- Meter: RF Display
- Mode: STD
- Input Level: uV or W
- Display: Bar Graphs
- Squelch: Mid-range or adjust as necessary
• Initial setup using the 8901_ Series Modulation Analyzer: