Crown FM30 - Page 5

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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 5–3
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