38Khz Subcarrier Suppression; Additional Checks - Crown FM30 User Manual

5.20 38–kHz Subcarrier Suppression
With no modulation, but in the Stereo mode, the 38–kHz subcarrier, as indicated on an FM
modulation monitor, should be down at least 40 dB.

5.21 Additional Checks

In addition to the tests and adjustments mentioned in this section, the following checks en-
sure a complete performance appraisal of the transmitter:
1. Perform a physical inspection, looking for visible damage and checking that the chassis
hardware and circuit boards are secure.
2. Check the functionality of switches and processing control.
3. Verify that all indicators function.
4. Check the frequency synthesizer lock at 80 MHz and 110 MHz.
5. Measure the AC line current with and without the carrier on.
6. Perform a functional test of the SCA input, Monitor outputs, and the monitor and control
function at the 15–pin, D-sub connector.
7. Test the functionality of the FSK circuit.
8. Check the operation and timing of the automatic carrier-off circuitry associated with pro-
gram failure.
9. Check all metering functions.
10. Test ALC action with PA current overload, SWR, and PLL lock.
NOTE:
FCC type acceptance procedures call for testing the carrier frequency over the temperature
range of 0–50 degrees centigrade, and at line voltages from 85% to 115% of rating. (See
FCC Part 2.1055.)
5-10 FM30/FM150/FM300 User's Manual