If Alignment; Line Level Adjustment; Reference Oscillator Calibration - RF Technology Eclipse Series Operation And Maintenance Manual

6.3 IF Alignment

6.3 IF Alignment
Step
1
2
3
4
5
6
7

6.4 Line Level Adjustment

Step
1

6.5 Reference Oscillator Calibration

Step
1 None required
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RF Technology R800
Input
Signal generator on
centre frequency
channel to J1.
Modulation OFF.
As above
Set generator level
to 10uV
Set generator level
to 1 millivolt.
Modulation ON
As Above
As above
Set generator level
to approx 0.25uV
Input
Signal generator on
centre frequency
channel to J1.
Modulation ON.
Level 1 millivolt
Input
Frequency Junction of R69
and R26 on the top of the
PCB. (L.O. input to the
mixer)
6 ALIGNMENT PROCEDURE
Measure
dc Volts on test
socket pin 7 to pin
1
As above
Frequency U3 pin 9 L9 to read 455KHz
Audio level test
socket pin 6 to pin
1
As Above
Audio level P1 pin
18 to pin 5
SINAD on test
socket pin 6 to pin
1
Measure
Audio level test
socket pin 6 to pin
1
Measure
Adjust
Generator level to
read 2-3Vdc.
L5,L6,L7,L8 For
max. Reduce
generator output to
keep below 3Vdc
+/- 10Hz
Line level (RV3) to
obtain approx.
1Vrms
L10 for maximum
RV1 for .5Vrms
Reduce generator
level to obtain
12dB SINAD.
Carefully adjust
L5,L6,L7,L8 to
obtain the best
SINAD. Reduce
the generator
output to maintain
12dB SINAD.
Adjust
RV3 for 775mV
rms
Calibration
X01 for L.O. +/-
100Hz
L.O. =Fc+45MHz
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