TM 11-5841-291-12
c. SAM Receiver Threshold Test
(3) Ask technician in cockpit to
(Low Pass Filter in Circuit). Perform
make sure that system's circuit
the procedures listed below.
breaker is turned on (closed)
and that POWER switch on con-
NOTE
trol unit is set to ON.
NOTE
On aircraft where low pass filter
is connected in the rf path be-
tween SAM antennas and SAM
Check and adjust position of cock-
receiver, use this procedure to
pit dimmer control for visible
test receiver threshold level.
edge lighting and alert indicator.
(1) Consult aircraft technical man-
(4)
Set gun's function switch to
LO BND.
ual to find out where low pass
filter is located. Disconnect
(5)
SAM antenna rf cables from
Squeeze gun's trigger switch
input rf connectors on filter.
and observe that meter indi-
cates betwwen -2 and +2 dB. At
(2) Make test connections shown
this time, ask technician in
here to one input rf connector
cockpit to verify that SAM indi-
on low pass filter and RF TEST
cator light is on and that warn-
jack on gun. Connect 50-ohm
ing tone can be heard in headset.
termination to other input rf
connector on filter.
(6)
Release trigger switch and check
with other technician that indi-
NOTE
cator light goes out and that
warning tone stops.
Microwave test cable and 50-ohm
(7)
termination are components of
Repeat steps (2) through (6)
Simulator, Radar Signal SM-756/
above at other input rf con-
APR-44(V).
nector on low pass filter.
3-8
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