Alignment Procedure - AEA COMPUTER PATCH CP-1 Instruction Manual

Each CP-1 has been carefully aligned after an elevated temperature
oven burn-in and has passed many tests before it leaves the factory.
However, many amateurs like to keep their equipment aligned to
specifications. The follow ing describes how to tune your CP-1:
Test equipment needed:
Filter Adjustment:
1. Connect power to the CP-1 and turn the unit 'on';
2. Set filte r switch to '170' position;
3. Set your signal generator to 2125 Hz as indicated on your
frequency counter. Connect your signal generator to the 'audio in'
jack;
4. Adjust R18 and R39 for maximum signal out of the 'mark o ut' jack
on the back of the CP-1 as measured with your scope;
5. Set the frequency generator to 2295 (as indicated on thefrequency
counter). Adjust R12 and R34 for maximum signal out of the 'space
out' jack;
6. Set filte r switch to VAR and turn the 'VAR shift' control full
clockwise;
7. Set frequency generator to 3125 Hz, adjust R10 and R18 for
maximum signal out of 'space o ut';
8. Adjust 'VAR S hift' full counter-clockwise;
9. Set frequency generator to 2225 Hz, adjust R8, R31 for maximum'
signal out of 'space o ut';
AFSK Adjustment:
1. Set filte r switch to '170';
2. On P in 2o fU 1 4,m e a sureth esign a l w ith yo urfreq u en cyco un ter. It
should measure 2125. Adjust R87 to correct frequency output;
3. Ground Pin 2 of the TTL plug on the rear of the CP-1 (make sure
the TTL/RS-232 Switch is 'in'). Again on Pin 2 of U14, measure
signal with your frequency counter. It should measure 2295.
Adjust R89 to correct frequency output.

ALIGNMENT PROCEDURE

1. Oscilloscope;
2. Audio Frequency Generator,
3. Frequency counter;