WJ-8611 DIGITAL VHF/UHF RECEIVER
6-6 MAINTENANCE
4.
Observe the signal level at the SDU Output, as indicated on the RF
millivoltmeter. The level should be at least -48 dBm, indicating at
least 12 dB of gain from the RF Input to the SDU Output.
6.6.5 SIGNAL STRENGTH ACCURACY
1.
Connect the signal generator to the RF Input of the receiver.
2.
Set the signal generator as follows:
Frequency:
250.0000
MHz
Output Level:
-90 dBm
Modulation
Off
3.
Set the receiver as follows:
Tuned Frequency: 250.00000 MHz
IF BW:
20.0 kHz
Detection
AM
Gain Control
AGC Fast
Squelch:
Off
4.
Verify the SIGNAL(dBm) display on the front panel indicates
between -80 and -110 dBm.
5.
While observing the SIGNAL(dBm) display, set the signal generator
output to -55 dBm, and then to -15 dBm. Verify that the display
responds as follows:
Input
Level SIGNAL(dBm)
Display
-55 dBm
-40 to -70 dBm
-15 dBm
0 to -30 dBm
6.6.6 SQUELCH OPERATION PERFORMANCE TEST
1.
Connect the test equipment as illustrated in
Figure 6-3
.
2.
Set the signal generator as follows:
Frequency:
250.0000
MHz
Output Level:
-20 dBm
Modulation
AM, 50%, 1 kHz
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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