Watkins-Johnson Company WJ-8718-19/FE Instruction Manual page 161

MAINTENANCE
WJ-8718-19/FE HF RECEIVER
Table 4-3. WJ-8718-19/FE HF Receiver Checkout Procedure. (Cont'd)
Step
3. IF Gain
(Cont'd)
4. Detection
Mode
4-8
Test
Equipment
HP8640B
HP400-EL
HP180C
Boonton 92B
Control Settings and
Instructions
e. Decrease Sig. Gen.
to 15.00350 MHz.
Select LSB Mode.
Read RF V.M. level.
f. Increase Sig. Gen.
to 42.0000 MHz.
Select AM mode and
6.0 kHz bandwidth.
g. Increase Sig. Gen.
to 76.5 MHz.
a. Set Sig. Gen. to
15.00500 MHz, -97dBm,
30% AM at 400 Hz. Set
receiver to AM Mode,
6.0 kHz BW. Set AC
V.M.to 50 Vac range.
Set HP180C A-input to
20 V/cm, B-input to
5 V/cm, time base to
1 msec. Set RF Gain
for -15 dBm on RF V.M.
b. Rotate PHONE LEVEL
control until 400 Hz
is heard in headphones.
c. Rotate LINE AUDIO
LEVEL control until AC
V.M. indicates 0.707
Vrms (0 dBm).
d. Depress A-Input
switch on oscillo
scope and observe
Line Audio waveform.
e. Turn off Sig. Gen.
modulation. Set re
ceiver to CW mode,
6.0 kHz BW, -0.4 kHz
BFO Offset.
Monitor Headphone.
Normal
Indication
-15 dBm
+/- 4 dBm
-4 dBm
+/- 4 dBm
-6 dBm
+/- 4 dBm
Clear 400 Hz
tone, no
distortion.
0.707 Vrms
Clean sine
wave, no
clipping.
Clear 400 Hz
tone, no
distortion.
IF Indication
is Abnormal
Refer to Table
4-4, step 3e.
Refer to Table
4-4, step 3f.
Refer to Table
4-4, step 3g.
Refer to Table
4-4, step 4a.
Refer to Table
4-4, step 4b.
Refer to Table
4-4, step 4c.
Refer to Table
4-4, step 4d.