Page 16
RF Technology R350/R500
6
ALIGNMENT PROCEDURE
6.3 IF Alignment
Step
Input
Measure
Adjust
1
Select alignment
frequency channel
dc Volts on test socket
pin 9 to pin 1
L34 to read 4.00Vdc
2
Signal generator on
centre frequency
channel to J1.
Modulation off.
dc Volts on test socket
pin 7 to pin 1
Generator level to
read 1 - 2 Vdc
3
As Above
As Above
L29, L31, L36, L38
for maximum reading.
Reduce generator
output to keep below
2 Vdc
6.3
IF Alignment
Step
Input
Measure
Adjust
1
Signal generator on
center frequency
channel to J1.
Modulation OFF
dc Volts in test socket
pin 7 to pin 1
Generator level to
read 1 - 2 Vdc
2
As Above
As Above
L5, L6, L7, L8 for
maximum reading.
Reduce generator
output to keep below
2 Vdc
3
Set generator level to
10
µ
V
Frequency U3 pin 9
L9 to read 455 KHz
+/- 10Hz
4
Set generator level to
1 millivolt.
Modulation ON.
Audio level test socket
pin 6 to pin 1
Line level (RV3) to
obtain approx.1Vrms
5
As Above
As Above
L10 for maximum
6
As Above
Audio level P1 pin 18
to pin 5
RV1 for 0.5 Vrms
7
Set generator level to
approx. 25
µ
V
SINAD on test socket
pin 6 to pin 1
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
