TB 9-6625-152-24
(33) Record measuring receiver power indication (e.g. -21.0 dBm).
(34) Press TI [Pad In/Out] key to set pad state to IN.
(35) Record measuring receiver power indication (e.g. -31.8 dBm).
(36) Subtract indication recorded in (33) above from indication recorded in (35) above.
The difference is actual attenuation of 10 dB pad (e.g. 31.8 dBm 21.0 dBm = 10.8 dBm). As per
example, TI correction factor would be +0.8 dB.
(37) Use TI rotary knob to alter data to calculated correction factor value.
(38) Use TI [ ], [ ] keys to highlight next calibration point in displayed table.
(39) Repeat technique of (32) through (38) above for all remaining frequencies in TI
displayed table.
(40) Select TI 20 dB PAD CAL screen and repeat technique of (32) through (39)
above for 20 dB pad.
(41) Select TI 40 dB PAD CAL screen and repeat technique of (32) through (39)
above for 40 dB pad.
(42) Select TI second 40 dB PAD CAL screen and repeat technique of (32) through
(40) above for second 40 dB pad.
(43) When all calibration points have been set up with correction factors, press TI
[Return] key and then [Store Cal] key.
(44) Set all outputs to minimum and disconnect equipment setup.
(45) Perform paragraph 9 a above.
10. Residual FM and AM
a. Performance Check
(1) Connect measuring receiver sensor module to TI BNC output.
(2) Set TI as listed in (a) through (g) below:
(a) Press RF IN/OUT SELECT to select BNC output.
(b) Press Rx TEST key then [RF Gen].
(c) Press FREQ and set to 1000 MHz.
(d) Press LEVEL and set to 0 dBm.
(e) Press Rx TEST, [Mod Gen], [Gen1/Gen2] until MOD1 FREQ is
highlighted, then press ON OFF key to off.
(f) Press Rx TEST, [Mod Gen], [Gen1/Gen2] until MOD2 FREQ is
highlighted, then press ON OFF key to off.
(g) Press Rx TEST, [RF Gen] then press ON OFF key to on.
(3) Configure measuring receiver for FM deviation measurement with 300 Hz high
pass filter, 3 kHz low pass filter and RMS detector activated. If measuring receiver
indication is not within limits specified in first row of table 5, perform b below.
