WJ-8711A DIGITAL HF RECEIVER
MAINTENANCE
7-15
4.
Set the WJ-8711A Receiver as follows:
Tuned Frequency:
15.000000 MHz
FRQ 15 <Return>
Detection Mode:
AM
DET 1 <Return>
IF Bandwidth:
16.0 kHz
BWS 5 <Return>
Gain Control:
AGC Slow
AGC 1 <Return>
RF Input Path
Normal
RFP 1 <Return>
Squelch:
Off
SQL 136 <Return>
5.
Note the IF Output signal level, as indicated on the RF millivoltmeter. Verify
that the output level is -20
±
3 dBm (-23 to -17 dBm).
6.
While observing the signal level on the RF millivoltmeter, increase the signal
generator output level, in 10 dB increments, to an output level of 0 dBm.
Verify that throughout the 100 dB change in the RF input signal level, the IF
output level -20
±
3 dBm is maintained.
7.
Decrease the signal generator output level to -115 dBm.
8.
Set the receiver to the Manual Gain mode [ AGC 0 <Return> ] and set the
manual gain to maximum [ RFG 127 <Return> ].
9.
Adjust the signal generator output level to produce a -20 dBm reference level,
as displayed on the RF millivoltmeter (Typical signal generator output level
of -112 dBm).
10.
Set the receiver manual gain to minimum [ RFG 0 <Return> ].
11.
Increase the signal generator output level to +12 dBm and note the signal
level indicated on the RF millivoltmeter. Verify that the RF millivoltmeter
indication is less than the -20 dBm reference set in step 9, indicating greater
than 100 dB of manual gain control.
12.
Adjust the signal generator output level to -55 dBm.
13.
Set the receiver manual gain to approximately mid-range [ RFG 60
<Return>].
14.
Increase the signal generator output level until a -20 dBm signal level
reference is indicated on the RF millivoltmeter. Typically a signal generator
output level of approximately -50 dBm is required.
15.
While observing the RF millivoltmeter, slowly increase the signal generator
frequency until the RF millivoltmeter indication decreases by 3 dB from the
reference set in step 14. Note the signal generator frequency at this point.
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8711A
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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...
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Page 47: ...3 i SECTION III LOCAL OPERATION Courtesy of http BlackRadios terryo org...
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Page 93: ...4 i SECTION IV RS 232 REMOTE OPERATION Courtesy of http BlackRadios terryo org...
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Page 123: ...5 i SECTION V CSMA REMOTE CONTROL Courtesy of http BlackRadios terryo org...
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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...
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Page 189: ...8 i SECTION VIII REPLACEMENT PARTS LIST Courtesy of http BlackRadios terryo org...
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Page 241: ...FP i FOLDOUTS Courtesy of http BlackRadios terryo org...
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