Figure. 13. Receiver Card Layout.

Calibration Procedure For Transponder Set Test Set An/Apm-424(V)2 Page Navigation
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TB 9-6625-2197-40

(14) Remove radar test set oscilloscope test probe from TJ 29 of control box and

connect to TP3 (fig. 13) of the receiver card.

(15) Adjust radar test set RF output power to -11 dBm (include circulator and cable loss).

(16) If radar test set oscilloscope does not display waveform (fig. 6, inset J), adjust

radar test set RF power output level until waveform is just solid.

(17) If RF power output level of the radar test set (at the just solid waveform point),

including insertion loss of circulator and cable, is not between -9 and -13 dBm, perform b

(5) and (6) below.

b. Adjustments

(1) Adjust radar test set RF power output to include insertion loss of circulator and

cable values for a level as close to -24 dBm as possible at TI SUM connector input.

(2) Adjust R67 (fig. 13) until waveform (fig. 6, inset H) is at the just solid point.

(3) Adjust radar test set RF power output to include insertion loss of circulator and

cable values for a level as close to -21 dBm as possible at TI SUM connector input.

(4) Adjust R69 (fig. 13) until waveform (fig. 6, inset I) is at the just solid point.