TB 9-6625-1914-24
38. Residual Responses
a. Performance Check
(1) Connect termination to RF INPUT connector.
(2) Set SCAN WIDTH switch to FULL and INPUT ATTENUATION switch to 0 dB.
(3) Set IF plug-in SCAN TIME PER DIVISION switch to 10 sec and LOG REF
LEVEL switch to -60 dBm.
(4) Observe sweep across entire band. No response will occur on display above level
of -90 dBm (3 graticule lines from top of display). Disregard LO feed-through signal at left
end of display.
b. Adjustments. No adjustments can be made.
39. Sensitivity
a. Performance Check
(1) Position TI controls as listed in (a) through (f) below:
(a) BAND switch to 1.50-3.55 GHz.
(b) FREQUENCY control to 1.5 GHz.
(c) SIGNAL IDENTIFIER switch to OFF.
(d) BANDWIDTH switch to 10 kHz.
(e) SCAN WIDTH switch to ZERO.
(f) INPUT ATTENUATION control to 0 dB.
(2) Position IF plug-in controls as listed in (a) through (d) below:
(a) BASE LINE CLIPPER control fully ccw.
(b) SCAN TIME PER DIVISION switch to 20 ms.
(c) LOG REF LEVEL controls to -50 dBm.
(d) VIDEO FILTER switch to 100 Hz.
(3) Slowly adjust FREQUENCY control throughout band range. The average noise
level displayed on TI display will be below -107 dBm level (graticule line is now -50 dBm).