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

Radio Information

Reference
Oscillator
Alignment
Figure 7 shows a typical 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:

Figure 7. Radio Information Screen

Radio Alignment Procedures
21