MTR3000 Performance Check or Testing: Verifying Transmitter Circuitry 12-3
• If the proper display is not obtained, suspect faulty SCM or Exciter Module
7. Set the Aeroflex 3900 Series Communications System Analyzer for GEN/MON MTR. Press
the PTT button and speak loudly into the microphone to cause maximum deviation. Display
should read:
• 4.60 kHz maximum for a 25 kHz system
• 3.68 kHz maximum for a 20 kHz system
• 2.30 kHz maximum for a 12.5 kHz system
If the proper display is not obtained, suspect faulty SCM or Exciter Module.
8. This completes the Verifying Transmitter Circuitry test procedure. If all displays and
measurements are correct, the transmitter circuitry may be considered to be operating
properly. Remove test equipment, restore the base station/repeater to normal service, and (if
applicable) return to the troubleshooting flow chart to resume troubleshooting sequence.
12.2.3.1 Station Reset
In the event the base station/repeater is powered from a DC source and repeatedly resets:
1. Disconnect DC power to PA and connect a load to the PA Module.
2. Power the base station/repeater from an AC source instead.
3. If the base station/repeater is not resetting, there is a problem with the PA or the DC source.
If the base station/repeater is resetting, there is a problem with another module in the base
station/repeater.
4. Reconnect DC power to the PA.
5. If the base station/repeater does not reset, key the base station/repeater.
6. If the base station/repeater is resetting, it "may" be a problem with the PA, or it could be a
problem with the Exciter, or Power Supply as well.
12.2.3.2 Station Unable to Power Up with Live DC or AC mains
In the event that the base station/repeater is not powering up with live DC or AC mains present:
1. Look for the proper output voltage when the power supply is running (Refer to Section 7.4.2
on page 7-7).
2. Check the two fuses on the backplane interface board and ensure that they are not blown
(Refer to Section 6.2 on page 6-26).
Note
The deviations are calculated with Relative Standard Deviation (RSD) set to 92% RSD
(rated system deviation).
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