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President Jackson CB-Radio


ALIGNMENT PROCEDURE


TRANSMITTER PORTION


Test equipment required:
Power Supply: 13,8 VFrequency CounterDC VoltmeterOscilloscope
50 ohm RF Dummy LoadLF SSG

StepConditionAdjustmentProcedure
1Band C, Channel 19
Mode: USB TX
No modulation
Mic Gain: Max.
PA/CB: CB
VR10Disconnect the PCB-834 from Check Point of Main PCB and connect DC Ammeter to TP8 +, TP6 -. Adjust for 50mA on DC Ammeter.
2Same as STEP 1VR9Connect AS Ammeter to TP8 +, TP7 -. Adjust to obtain the current 80mA.
3Same as STEP 1L42Connect PCB-834 to Check Point of main PCB. Connect RF Power Meter, RF VTVM and Oscilloscope to Dummy Load. Set VR8 Max. Turn core of L42 ClockWise to maximum at the bottom.
4Same as STEP 1L41 L43 L49Adjust coils for maximum indication. While then, keep output voltage under 25V by adjusting LF SSG
5Band E, Channel 40
Mode: USB TX
No modulation
Mic Gain: Max.
PA/CB: CB
L42Set E-band Ch. 40, adjust for maximum reading and then set A-band Ch. 1 and adjust for minimum difference from Band E Ch. 40.
6Band E, Channel 19
Mode: USB TX
No modulation
Mic Gain: Max.
PA/CB: CB
L30Adjust L30 to obtain the maximum indication on the RF VTVM.
7Same as STEP 6VR8Adjust VR3 to obtain RF output of 32.4V on RF VTVM.
8Same as STEP 1VR5Adjust VR5 to obtain the minimum carrier leakage between USB and LSB.
9Band E, Channel 19
Mode: AM TX
No modulation
Mic Gain: Max.
PA/CB: CB
VR11Adjust VR11 to obtain RF carrier power of 10Watt on RF Power Meter.
10Band C, Channel 19
Mode: USB TX
No modulation
Mic Gain: Max.
SW: S/RF
VR7Adjust for the needle of Bilt-in Meter to blank zone of TX Power meter.
11Same as STEP 10VR12Adjust VR12 to obtain 90% (negative) modulation.
12Band C, Channel 19
Mode: FM TX
No modulation
Mic Gain: Max.
PA/CB: CB
VR4Connect Deviation Meter. Adjust for 3kHz Deviation on DeviationMeter.
13Band C, Channel 19
Mode: USB TX
No modulation
Mic Gain: Max.
SW: MOD
VR3Set AF SSG to 50% Modulation, then add 16dB. Adjust VR3 to 100% modulation indication on the Tranceiver meter.
14Band C, Channel 19
Mode: AM TX
No modulation
Mic Gain: Max.
VR6Adjust Transmitter Frequency for 27.185MHz +/- 100Hz on Frequency Counter.