Watkins-Johnson Company WJ-8718-19/FE Instruction Manual page 162

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MAINTENANCE
Table 4-3. WJ-8718-19/FE HF Receiver Checkout Procedure. (Cont'd
Step
Test
Equipment
4.
Detectior
Mode
(cont'd)
5. SNR
6. MAN/AGC
Operation
HP8640B
HP400-EL
HP8640B
HP400-EL
Boonton 92B
Control Settings and
Instructions
f. Increase Sig. Gen.
to 15.00540 MHz.
Select USB Mode.
Monitor headphones.
g. Decrease Sig. Gen.
to 15.00460 MHz.
Select LSB Mode.
Monitor headphones.
h. Depress B-input
switch on oscillo
scope. Observe
Phone Audio output
waveform.
a. Set Sig. Gen. to
15.00500 MHz, -97 dBm,
50% AM at 400 Hz. Set
receiver to 15.005 MHz.
Set RF Gain for -15 dBrji
on RF V.M. Set AC V.M.
for convenient meter
indication and note
level.
b. Turn Gen. modulation!
off and note reduction
in AC V.M. level.
c. Set Sig. Gen. and
receiver to 42.00000
MHz. Repeat steps a
and b above.
. d. Set Sig. Genn and
receiver to 76.500000
MHz. Repeat steps a
and b above.
a. Set Sig. Gen. to
15.00500 MHz, -97 dBm,
30% AM at 400 Hz. Set
receiver to AM Mode,
6.4 kHz BW, MAN GAIN
mode. Set RF GAIN for
-15 tlBlll oil RF V.M.
Normal
Indication
Clear 400 H2
tone, no
distortion.
Clear 400 Hz
tone, no
distortion.
>22 Vpp at
400 Hz, no
clipping.
> 10 dB
reduction
> 10 dB
reduction
> 10 dB
reduction
IF Indication
is Abnormal
Refer to Table
4-4, step 4e.
Refer to Table
4-4, step 4f.
Refer to Table
4-4, step 4g.
Refer to Table
4-4, step 5a
Refer to Table
4-4, step 5c.
Refer to Table
4-4, step 5d.
4-9