Crown FM30 User Manual page 5

Section 5-Adjustments and Tests ................................. 5-1
5.1 Audio Processor Adjustments ........................................................................... 5-2
5.1.1 Pre-Emphasis Selection ................................................................................ 5-2
5.1.2 Pre-Emphasis Fine Adjustment ..................................................................... 5-2
5.2 Stereo Generator Adjustments .......................................................................... 5-2
5.2.1 Separation .................................................................................................... 5-2
5.2.2 Composite Output ......................................................................................... 5-2
Using a Modulation Monitor
5.2.3 19-kHz Level ................................................................................................ 5-4
5.2.4 19-kHz Phase ............................................................................................... 5-4
5.3 Frequency Synthesizer Adjustments .................................................................. 5-4
5.3.1 Frequency (Channel) Selection ...................................................................... 5-4
5.3.2 Modulation Compensator .............................................................................. 5-4
5.3.3 Frequency Measurement and Adjustment ..................................................... 5-4
5.3.4 FSK Balance Control ..................................................................................... 5-5
5.4 Metering Board Adjustments ............................................................................. 5-5
5.4.1 Power Calibrate ............................................................................................. 5-5
5.4.2 Power Set ..................................................................................................... 5-5
5.4.3 SWR Calibrate ............................................................................................... 5-5
5.4.4 PA Current Limit ........................................................................................... 5-6
5.5 Motherboard Adjustments ................................................................................. 5-6
5.6 Display Modulation Calibration .......................................................................... 5-6
5.7 Voltage Regulator Adjustments ......................................................................... 5-6
5.8 Bias Set (RF Power Amplifier) ........................................................................... 5-7
5.9 Performance Verification ................................................................................... 5-7
5.9.1 Audio Proof-of-Performance Measurements ................................................. 5-7
5.9.2 De-emphasis Input Network .......................................................................... 5-7
5.10 Carrier Frequency .............................................................................................. 5-8
5.11 Output Power .................................................................................................... 5-8
5.12 RF Bandwidth and RF Harmonics ...................................................................... 5-8
5.13 Pilot Frequency ................................................................................................. 5-8
5.14 Audio Frequency Response ............................................................................... 5-9
5.15 Audio Distortion ................................................................................................ 5-9
5.16 Modulation Percentage ...................................................................................... 5-9
5.17 FM and AM Noise .............................................................................................. 5-9
5.18 Stereo Separation .............................................................................................. 5-9
5.19 Crosstalk ........................................................................................................... 5-9
5.19.1 Main Channel Into Sub .............................................................................. 5-10
5.19.2 Sub Channel Into Main .............................................................................. 5-10
5.20 38-kHz Subcarrier Suppression ...................................................................... 5-10
5.21 Additional Checks ............................................................................................ 5-10
5-3
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