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table of contents

 
 
3.4.5 Crystal Calibrator..............................................................................
3.5 Vox and Antivox Circuits.....................................................................
 
Section 4 Service Instruction...................................................................
 
4.1 General..............................................................................................
4 2 Transmitter Signal Tracing....................................................................
4.3 Reciver Signal Tracing.........................................................................
4.4 Voltage and Resistance Measurements.................................................
4.5 Field Alignment Procedures..................................................................
4.5.1 Field Alignment................................................................................
4.5.2 Test Equipment Required..................................................................
4.5.3 RF ciruits Peaking............................................................................
4.5.4 VFO Sideband Frequency Shift Adjustment........................................
4 .5.5 Carrier Balance (Null) Adjustment....................................................
4.5.6 ALC Zero Adjustment......................................................................
4 .5.7 First Mixer Balance Adjustment.......................................................
4.5.8 S-Meter Zero Adjustment..................................................................
4.5.9 Crystal Calibrator Adjustment............................................................
4.5.10 VFO End-Point Adjustment..............................................................
4.5.11 VFO Dial Centering........................................................................
4.5.12 VFO Overtravel..............................................................................
4.6 Laboratory Alignment Procedures.........................................................
4.6.1 Laboratory Alignment........................................................................
4.6.2 Test Equipment Required...................................................................
4 .6.3Transmitting 455-kHz IF Alignment....................................................
4.6.4 Bandpass IF Alignment.....................................................................
4 .6.5 RF Circuits Alignment.....................................................................
4.6.6 Crystal Oscillator Alignment.............................................................
4 .6.7 VFO Sideband Frequency Shift Adjustment....................................
4.6.8 Carrier Balance (Null) Adjustment...................................................
4 .6.9 ALC Zero Adjustment...................................................................
4.6.10 First Mixer Balance Adjustment.....................................................
4.6.11 VFO Dial Calibration....................................................................
4.6.12 PA Neutralizing.............................................................................
4.6.13 Driver Neutralizing........................................................................
4.6. 14 Feedback Neutralizing..................................................................
4.6.15 PA Loading Trimmer Adjustment...................................................
4.6. 16 Receiving 455-kHz IF Alignment..................................................
4.6.17 Receiver RF Gain and S-Meter Zero Adjustment............................
4.7 Test Select Components......................................................................
4.7.1 Capacitor C10.................................................................................
4.7.2 Resistor R140.................................................................................
4.7.3 Resistor R162................................................................................
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