WJ-8711A DIGITAL HF RECEIVER
MAINTENANCE
7-17
4.
Set the WJ-8711A Receiver as follows:
Tuned Frequency:
10.000000 MHz
FRQ 10 <Return>
Detection Mode:
AM
DET 1 <Return>
IF Bandwidth:
16.0 kHz
BWS 5 <Return>
Gain Control:
Manual Gain
AGC 0 <Return>
Gain Setting
Mid Range 060
RFG 60 <Return>
RF Input Path
Normal
RFP 1 <Return>
Squelch:
Off
SQL 136 <Return>
5.
Adjust the signal generator output level as required to produce a -30 dBm
reference level, as indicated on the RF millivoltmeter.
6.
Determine the RF Assembly gain by comparing the signal generator output
level with the SMO signal level indicated on the RF millivoltmeter.
Typically, the signal gain ranges between 25 and 35 dB.
7.
While observing the signal level on the RF millivoltmeter, slowly increase the
signal generator frequency until a decrease of 3 dB, from the reference set in
step 5, is observed. Note the signal generator output frequency at this point.
8.
Slowly decrease the signal generator frequency past the 10.0000 MHz tuned
frequency and continue until the RF millivoltmeter again displays a 3 dB
decrease in signal level from the reference set in step 5. Note the signal
generator output frequency at this point.
9.
Determine the 3 dB bandwidth of the RF signal path by subtracting the
frequency value obtained in step 8 from the value obtained in step 7. The
calculated bandwidth should be at least 0.0300 MHz (30.0 kHz).
10.
Return the signal generator output frequency to 10.000000 MHz and adjust
the output level as required to obtain a -30 dBm reference level on the RF
millivoltmeter.
11.
Set the RF Input path of the receiver to the ATTENUATED selection. [ RFP
2 <Return> ]
12.
Note the signal level indicated on the RF millivoltmeter. The signal level
should decrease by 15
±
3 dB from the reference level set in step 10.
13.
Set the RF millivoltmeter to the -20 dBm range and set the receiver RF Input
path to the PREAMPLIFIED selection. [ RFP 3 <Return> ]
14.
Note the signal level indicated on the RF millivoltmeter. The signal level
should increase by 10
±
3 dB from the reference set in setup 10.
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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