MAINTENANCE
WJ-8711A DIGITAL HF RECEIVER
7-16
16.
Slowly decrease the signal generator frequency past the 15.0000 MHz tuned
frequency and continue until the RF millivoltmeter again displays a 3 dB
decrease from the reference level set in step 14. Note the signal generator
frequency at this point.
17.
Determine the 3 dB bandwidth of the reconstructed IF output by subtracting
the value obtained in step 16 from the value obtained in step 15. The
calculated bandwidth should be within
±
10% of the selected IF bandwidth, as
indicated in
Table 7-3
.
Table 7-3. Selected IF Bandwidth Frequency Range
IF BW (kHz)
Control Command
BW Min. (kHz)
BW Max. (kHz)
0.30
BWS 1 <Return>
0.270
0.330
1.00
BWS 2 <Return>
0.900
1.100
3.20
BWS 3 >Return>
2.880
3.502
6.00
BWS 4 <Return>
5.400
6.600
16.0
BWS 5 <Return>
14.400
17.600
18.
Set the WJ-8711A Receiver to each of the IF bandwidths listed in
Table 7-3
,
and repeat steps 14 through 17 for each selection.
7.6.10
RF/IF SIGNAL PATH PERFORMANCE TEST
1.
Connect the WJ-8711A Receiver and test equipment as illustrated in
Figure 7-9
.
BOONTON
92B
RF MILLIVOLT
METER
50 OHM
LOAD
RECEIVER
SMO
A3J2
2031
SIGNAL
GENERATOR
RF IN
RF OUT
A3J1
87IL40
Figure 7-9. RF/IF Signal Path Performance Test Equipment Connection
2.
Set the signal generator to produce a 10.000000 MHz CW output at a level of
-70 dBm.
3.
Set the RF millivoltmeter to the -30 dBm range.
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Содержание WJ-8711A
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