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6
ALIGNMENT PROCEDURE
Step
Input
1
Select alignment
frequency channel
2
Signal generator on
centre frequency
channel to J1.
Modulation off.
3
Signal generator on
centre frequency
channel to J1.
Modulation off.
6.3
IF Alignment
Step
Input
1
Signal generator on
center frequency
channel to J1.
Modulation OFF
2
Signal generator on
center frequency
channel to J1.
Modulation OFF
3
Set generator level to
10 µ V
4
Set generator level to
1 millivolt.
Modulation ON.
5
Set generator level to
1 millivolt.
Modulation ON.
6
Set generator level to
1 millivolt.
Modulation ON.
7
Set generator level to
approx. 25 µ V
RF Technology R220
Measure
dc Volts on test socket
pin 9 to pin 1
dc Volts on test socket
pin 7 to pin 1
dc Volts on test socket
pin 7 to pin 1
Measure
dc Volts in test socket
pin 7 to pin 1
dc Volts in test socket
pin 7 to pin 1
Frequency U3 pin 9
Audio level test socket
pin 6 to pin 1
Audio level test socket
pin 6 to pin 1
Audio level P1 pin 18
to pin 5
SINAD on test socket
pin 6 to pin 1
6.3 IF Alignment
Adjust
L34 to read 4.00Vdc
Generator level to
read 1 - 2 Vdc
L29, 31, 36, 38 for
maximum reading.
Reduce generator
output to keep below
2 Vdc
Adjust
Generator level to
read 1 - 2 Vdc
L5, L6, L7, L8 for
maximum reading.
Reduce generator
output to keep below
2 Vdc
L9 to read 455 KHz
+/- 10Hz
Line level (RV3) to
obtain approx. 1
Vrms
L10 for maximum
RV1 for .5 Vrms
Reduce generator
level to obtain 12 Db
SINAD. Carefully
adjust L5, L6, L7, L8
to obtain the best
SINAD. Reduce
generator output to
maintain 12 dB
SINAD
Page 17
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