MAINTENANCE
WJ-8711A DIGITAL HF RECEIVER
7-8
5.
Slowly increase the signal generator output level to 0 dBm, in 10 dB
increments. At each increment, note the DC voltage displayed on the digital
voltmeter and verify the receiver signal level using the "SGV?" query. On the
Front Panel, observe the signal level on the signal strength meter.
6.
Verify that the receiver signal strength indication remains within
±
10 dB of
the signal generator output level. The DC voltage present at the RSSI output
should range from approxi1.0 V (-100 dBm) to +4.6 V (0 dBm). For
each 10 dB increase of input level, the RSSI level should increase by
approxi.35 V.
7.6.6
WJ-8711A SENSITIVITY PERFORMANCE TEST
1.
Connect the WJ-8711A Receiver and test equipment as illustrated in
Figure 7-5
.
BOONTON
92B
RF MILLIVOLT
METER
50 OHM
LOAD
RECEIVER
IF OUT
A2J1
2031
SIGNAL
GENERATOR
RF IN
RF OUT
A3J1
HP-400EL
AC VOLT
METER
600 OHM
LOAD
+
-
LINE A
AUDIO
TB1
87IL36
Figure 7-5. Receiver Sensitivity Performance Test Equipment Connection
2.
Set the WJ-8711A Receiver as follows:
Tuned Frequency:
0.500000 MHz
FRQ 5 <Return>
Detection Mode:
CW
DET 3 <Return>
BFO Offset:
+1000 Hz
BFO 1000 <Return>
IF Bandwidth:
See Table 7-2
Gain Control:
Manual
AGC 0 <Return>
Gain Setting:
Mid-Range 060
RFG 60 <Return>
RF Input Path
Preamplified
RFP 3 <Return>
Squelch:
Off
SQL 136 <Return>
3.
Set the receiver tuned frequency to 0.500000 MHz [FRQ .5 <Return>] and
set the signal generator to produce a .5000 MHz CW output at a level of
-116 dBm.
Courtesy of http://BlackRadios.terryo.org
Содержание WJ-8711A
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