TB 9-6625-2197-50
(d) Menu 16: SOURCE to LOW PWR and RF to a value that will provide
approximately -21 dBm input to the TI SUM connector (insertion loss of circulator and
cable must be included).
(4) Set radar test set oscilloscope controls for the parameters as listed in (a) through
(e) below:
(a) Autostore to RUN.
(b) TRIGGER SOURCE to 2.
(c) TIME/DIV to 5 s and press MAIN/DELAYED pushbutton for a softkey
menu TIME REF of LFT.
(d) CH1 VOLTS/DIV to 1.0 V.
(e) CH2 VOLTS/DIV to 2.0 V.
(5) Connect oscilloscope CH1 to TJ 30 on control box.
(6) Set control box PWR switch to ON and RPT switch to GND, then TEST.
(7) Adjust oscilloscope main TRIGGER LEVEL and HORIZONTAL position
controls to place positive leading edge of sync pulse from pulse generator (CH2) on second
graticule line. If waveform (fig. 6, inset K) is not present, adjust radar test set RF output
power level (up or down 1 dB) until waveform is correct.
(8) Observe oscilloscope display on CH 1. If oscilloscope does not display waveform
for ON FREQ PULSE (fig. 6, inset K), perform b below.
(9) Adjust MAIN FREQ (menu 10) to 1091 MHz. Oscilloscope will display
waveform (fig. 6, inset K) with reduced amplitude; if not, perform b below.
(10) Adjust MAIN FREQ (menu 10) to 1093 MHz. If oscilloscope does not display
OFF FREQ PULSE (pulse absent with +5 V level) (fig. 6, inset L), perform b below.
(11) Adjust MAIN FREQ (menu 10) to 1089 MHz. Oscilloscope will display
waveform (fig. 6, inset K) with reduced amplitude; if not, perform b below.
(12) Adjust MAIN FREQ (menu 10) to 1087 MHz. If oscilloscope does not display
OFF FREQ PULSE (fig. 6, inset L), perform b below.
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