Receiver Sensitivity

TB 9-4920-358-35

m. 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 radar test set Menu 16 RF output to obtain an ACCEPT/REJECT

threshold indication on TI (switch over point from ACCEPT/REJECT). Record radar test

set output dBm readings.

NOTE

At Menu 14 on radar test set, 0 TRIGGER may have to be

cycled from internal to external to obtain an ACCEPT light.

(3) Remove cable from TI RADIATED TEST ANTENNA connector (fig. 1) and

connect end of cable to peak power meter sensor.

(4) On radar test set Menu 11, set CW to ON and 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 radar test set Menu 11, CW to OFF. Disconnect cable from peak power

sensor and reconnect to the TI RADIATED TEST ANTENNA connector (fig. 1).

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.