TB 9-4920-358-24
n. Select radar test set Menu 16, POWER, and ENTER to perform measurement
sequence. When power reading is displayed, press up or down arrow to stop measurement.
TI ACCEPT lamp will be lit.
8. Receiver Sensitivity
a. Performance Check
(1) Note radar test set PRF indication on Menu 16 (lower left hand corner of display
screen). PRF reading will be between 252 and 262 PPS.
(2) Adjust signal generator RF output level to obtain an ACCEPT/REJECT
threshold indication on TI (switch over point from ACCEPT/REJECT). Record signal
generator output dBm readings.
NOTE
At Menu 14 on radar test set, 0 TRIGGER may have to be
cycled from internal to external to obtain a TI ACCEPT light.
connect end of cable to peak power meter sensor.
(4) On signal generator, set pulse modulation to off. Measure and record power
output at end of cable while cycling RF output between power settings noted in (2) above for
threshold point. Average result should be -6 dBm 1 dB, if not perform b below.
(5) Set signal generator pulse modulation to on. Disconnect cable from peak power
b. Adjustments
CAUTION
Use care to prevent the RF module from dropping out of TI
when positioning and adjusting TI.
(1) Set TI POWER switch to OFF and remove the housing from the RF MODULE
(fig. 2) as listed in (a) through (c) below.
(a) Disconnect the three RF cables from side of RF MODULE (fig. 2).
(b) Release the two hold-downs at opposite corners of module and gently lift RF
MODULE (fig. 2) A1 from its connector.