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7
Temporarily disable the pulse generator.
8 Using coax cable of minimum convenient length, connect the pulse generator,
the RF signal generator, and the radio to the two-way power divider.
9 Disable the noise blanker by placing SW801 to the OFF position.
10 Apply an on -channel signal to obtain12dB SINAD, then increase the RF generator
output by 40dB.
1 1 E nable the pulse generator to produce the 10nsec pulses. Adjust pulse amplitude
to return SINAD reading to 12 dB.
12 Switch SW801 to the ON position. The SINAD reading should improve.
13 Reduce the RF generator output until a 12 dB SINAD reading is obta i n e d .
14 Using a non -metallic tool, slowly tune L801(clockwise or counter-clockwise, as
required) for best SINAD.
slight. Tune L802 in the same manner. Repeat this step. Noise blanker
tuning is complete.
T a b l e 2 -2---- Noise Blanker Test Equipment
TEST INSTRUMENT
Pulse Generator
Power Divider,3 port:
The amount of L801 adjustment required should be
CAPABITIES
Pulse Rate: 5000 pulses per second
Pulse Width: Adjustable to 10 ns at
1/2 amplitude.
Output: Continuously variable from
0.1
to 10V peak into 50
Ω
50
each port, 6 dB attenuation,
D C to 50 MHz as defined in EIA Standard
R S-204C or RS-2 0 4 D A p p e n d i x A .
Ω
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