![Watkins-Johnson Company WJ-8711A Installation, Operation And Maintenance Manual Download Page 174](http://html1.mh-extra.com/html/watkins-johnson-company/wj-8711a/wj-8711a_installation-operation-and-maintenance-manual_3692029174.webp)
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.
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8711A
Page 4: ...iv THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 19: ...1 i SECTION I GENERAL DESCRIPTION Courtesy of http BlackRadios terryo org...
Page 33: ...2 i SECTION II INSTALLATION Courtesy of http BlackRadios terryo org...
Page 34: ...2 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 47: ...3 i SECTION III LOCAL OPERATION Courtesy of http BlackRadios terryo org...
Page 48: ...3 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 93: ...4 i SECTION IV RS 232 REMOTE OPERATION Courtesy of http BlackRadios terryo org...
Page 94: ...4 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 123: ...5 i SECTION V CSMA REMOTE CONTROL Courtesy of http BlackRadios terryo org...
Page 124: ...5 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 143: ...6 i SECTION VI CIRCUIT DESCRIPTION Courtesy of http BlackRadios terryo org...
Page 157: ...7 i SECTION VII MAINTENANCE Courtesy of http BlackRadios terryo org...
Page 158: ...7 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 189: ...8 i SECTION VIII REPLACEMENT PARTS LIST Courtesy of http BlackRadios terryo org...
Page 190: ...8 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 241: ...FP i FOLDOUTS Courtesy of http BlackRadios terryo org...
Page 242: ...FP ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...