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President Harrison CB-Radio


ALIGNMENT PROCEDURE


Transmitter Section


Test equipment required:
Power Supply: 13,2 VRF Power MeterOscilloscopeAudio Generator
Frequency CounterSpectrum Analyzer50 ohm Load

StepSettingConnectionAdjustAdjust for
1RF Driver stage
Mode: Transmit
Volume: Optional
Squelch: Optional
Channel: 19
Connect Oscilloscope to base of Q602T601
T602
Adjust for maximum wave-form on the oscilloscope
2RF Power stage
Mode: Transmit
Volume: Optional
Squelsch: Optional
Channel: 19
Connect dummy-load and RF Power-meter to external ANT-jackT604Adjust for maximum indication on the RF Power-meter
3Second harmonic check
Volume: Optional
Squelch: Optional
Channel: 19
Connect RF Power-meter with dummy-load to spectrum analyzerAt no modulation compare the level of fundamental freq-spectrum to the level of harmonic freq-spectrum.
Supression of the 2nd harmonic freq. level must be lower than -54dBm.
4Frequency check
Mode: Transmit
Volume: Optional
Squelch: Optional
Channel: 19
Connect dummy-load and Frequency-counter to ANT-jack.CT901Make sure that the indication of the transmit frequency is 27.185 MHz +/- 300 Hz.
5Max. modulation check
Mode: Transmit AM
Volume: Optional
Squelch: Optional
Channel: 19
Connect dummy-load and Modulation-meter to ANT-jack.VR401Adjust so that the indication of the Modulation-analyzer is 90% with +/- 5% tolerance at high power mode.
6Max. deviation check
Mode: Transmit FM
Volume: Optional
Squelch: Optional
Channel: 19
Connect dummy-load and Modulation-meter to ANT-jack.VR401Adjust so that the indication of the Deviation-analyzer is 2 kHz with +/- 0,2 kHz tolerance at high power mode.