WJ-8711A DIGITAL HF RECEIVER
MAINTENANCE
7-11
25.
While observing the AC voltmeter indication, turn off the signal generator RF
Output.
26.
Note the AC voltmeter level with the RF signal removed. Calculate the
signal-to-noise ratio by subtracting this level from the reference level noted in
step 24. The difference between these two levels should be a minimum of
16 dB.
27.
Temporarily remove the AC voltmeter and 600-ohm load from the Line A
output of TB1 and connect them across the + and - terminals of the Line B
output. Tune the signal generator to 1.0000 kHz below the receiver tuned
frequency and repeat steps 23 through 26 to verify the lower sideband of the
ISB outputs.
28.
Reconnect the AC voltmeter and 600-ohm load across the Line A output
terminals.
29.
Tune the receiver and signal generator to 5.0000 MHz, 15.0000 MHz, and
29.9000 MHz. In each case, set the signal generator frequency for 1.000 kHz
above the receiver tuned frequency. At each frequency, repeat the test
described in steps 23 through 27.
7.6.7
AUDIO DISTORTION PERFORMANCE TEST
1.
Connect the WJ-8711A Receiver and test equipment as illustrated in
Figure 7-6
.
HP-334A
DISTORTION
ANALYZER
600 OHM
LOAD
RECEIVER
LINE A +
TB1
2031
SIGNAL
GENERATOR
RF IN
RF
A3J1
AUDIO -
00-0026
OUT
Figure 7-6. Audio Distortion Performance Test Equipment Connection
2.
Set the signal generator to produce a 15.0000 MHz AM modulated signal at
an output level of -50 dBm. Set the AM modulation to 400 Hz, at 30%.
3.
Preset the distortion analyzer as follows:
Mode:
Manual
Frequency Range:
X10
Function:
Voltmeter
Meter Range:
1 Volt
Courtesy of http://BlackRadios.terryo.org
Содержание WJ-8711A
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