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President Grant CB-Radio


ALIGNMENT PROCEDURE


TRANSMITTER PORTION


Test equipment required:
Power Supply: 13,8 VAF Signal GeneratorRF Dummy Load 50 ohmOscilloscope
RF Power MeterFrequency Counter

Preparation alignment:
ClarifierMid.
SQ GAINMax.
AF GAINMax.
RF GAINMax.
MIC GAINMax.
MOD, S/RFS/RF
NB/ANLOff
StepConditionAdjustmentProcedure
1Mode: TX USB
27.185MHz
S1 and S2 OFF
VR11Disconnect PC834. Connect DC Current Meter on TP9(+) and TP8(-). Adjust for 50mA.
2Mode: TX USB
27.185MHz
S1 and S2 OFF
VR9Disconnect PC834. Connect DC Current Meter on TP9(+) and TP8(-). Adjust for 4mA.
3Mode: TX USB
27.185MHz
S1 and S2 OFF
VR10Disconnect PC834. Connect DC Current Meter on TP9(+) and TP8(-). Adjust for 80mA.
4Mode: TX USB
27.185MHz
S1 and S2 ON
Modulation: 2,4kHz and 500Hz
L46Set the core of L46 to the bottom, adjust VR12 to minimum.
5Mode: TX USB
27.185MHz
S1 and S2 ON
Modulation: 2,4kHz and 500Hz
L45 L48 L49Adjust the cores to obtain max. deviation on RF VoltMeter. Repeat this operation with lower AF levelss on MIC input.
6Mode: TX USB
27.185MHz
S1 and S2 ON
Modulation: 2,4kHz and 500Hz
L46Adjut to obtain max deviation on RF Voltmeter. Adjust to obtain a mimimum power difference between Ch.40 HIGH and Ch.1 LOW
7Mode: TX AM
27.185MHz
S1 ON
Modulation: 1kHz
L37Adjust to obtain max deviation on S/RF Meter
8Mode: TX AM
27.185MHz
S1 ON
Modulation: 1kHz
VR12Adjust to obtain 32,4 Volt on RF VoltMeter
9Mode: TX USB
27.185MHz
S1 and S2 OFF
VR7Adjust to obtain minimum difference between USB and LSB
10Mode: TX AM
27.185MHz
S2 OFF
VR13Adjust to obtain 10 Watt on RF Power meter
11Mode: TX AM
27.185MHz
S2 OFF
VR8Set Switch on S/RF. Adjust to set the S-meter between the Red and Green field
12Mode: TX AM
27.185MHz
S1 ON
Modulation: 1kHz 30mV
VR14Adjust to obtain 90 % AM-Modulation on Oscilloscope.
13Mode: TX FM
27.185MHz
S1 ON
Modulation: 1kHz 30mV
VR5Adjust to obtain +/- 2 kHz deviation on DeviationMeter.
14Mode: TX AM
27.185MHz
S1 ON
VR15Set switch on MOD, AF SignalGenerator to obtain 50% modulation. Adjust levels of AF Signal Generator to 16dB. Adjust VR15 to obtain 100% modulation on S-Meter.