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President Lincoln CB-Radio


ALIGNMENT PROCEDURE


TRANSMITTER PORTION


Test equipment required:
Power Supply: 13,8 VAF SSGRF VTVMDC AM-meter
AF VTVMFM Linear DetectorOscilloscopeRF Power Meter
Dummy Load, 50 ohm

Preparation alignment:
VR112Clockwise
VR113Counter Clockwise
VR103Clockwise
SWR/CALClockwise
RF GainMiddle position
PA SWOff
INDIC SWRF
Mic Gain SwOff
RF PowerMax.
Frequency28.000 MHz

StepConditionAdjustmentProcedure
1USB
No Mod.
VR112Remove the B002 (PB-100) from Main PCB. Connect a DC AM Meter to TP4 (+) and TP3 (-). Adjust VR112 for 50 mA reading on the DC AM Meter.
2USB
No Mod.
VR113Remove the B002 (PB-100) from Main PCB. Connect the DC AM Meter to TP4 (+) and TP2 (-). Adjust VR113 for 50 mA reading on the DC AM Meter
3USB
1 mV Mod.
L111Connect a RF Power Meter to Ant.jack. Connect a RF VTVM, an Oscilloscope and an RF Linear Dectector across an Dummy Load to the RF Power meter. Adjust L111 for maximum reading en the RF VTVM. During this step, set the AF Oscillator so that the output is less than 20 V. Repeat this step two times.
4USB
30 mV Mod.
VR104Adjust VR104 for 32.5 V reading on the RF VTVM.
5USB
30 mV Mod.
VR106Adjust VR106 so that the carrier leakage at USB and LSB become minimum and almost equal.
6CW
No Mod.
VR103Connect a SW between Pin 8 and 9 of ACC connector. When turn on the SW, adjust VR103 for 21 Watt reading on the RF Power Meter.
7AM
No Mod.
VR107Adjust VR107 for 10 Watt reading on the RF Power Meter
8AM
No Mod.
VR117Adjust VR107 so that "9" LCD just light on.
9AM
1 kHz 30 mV Mod.
VR114Adjust VR114 to obtain the 85% negative reading on the Oscilloscope.
10AM
1 kHz 1 mV Mod.
VR115INDIC: MOD. Adjust VR115 so that "9" LCD just light on.
11FM
1 kHz 30 mV Mod.
VR105Adjust VR105 for +/- 3 kHz deviation on the FM Linear Detector.
12CW
No Mod.
Vol.: Max.
VR116Connect an AF VTVM across a Dummy Load (8 ohm) between Pin 1 and Pin 2 of ACC connector. When turn on the SW, adjust VR116 for 0.4 V reading on the AF VTVM.