TB 9-6625-2237-24
(9) Connect equipment as shown in figure 5.
(10) Press and hold REC TEST PRESS button. Measuring receiver indication will
be between 242.997 and 243.003 MHz; if not perform b (l) below.
(11) Set RADIO SELECT switch to PRC-90 (282.8).
(12) Install calibration antenna No. 2 (282.8 MHz) on the antenna plate assembly as
described in (4) (a) through (e) above.
(13) Press and hold REC TEST PRESS button. Measuring receiver indication will
be between 282.796 and 282.804 MHz; if not, perform b (2) below.
(14) Disconnect measuring receiver power sensor from 4P3 (fig. 5) and connect RF
cable to 4P3 (fig. 5).
(15) Set RADIO SELECT switch to PRC-90 (243.0).
(16) Install calibration antenna No. 1 (243.0 MHz) on the antenna place assembly as
described in (4) (a) through (e) above.
(17) Connect measuring receiver sensor module to calibration antenna No. 1 (243.0
MHz).
(18) Press REC TEST PRESS button. Set measuring receiver to measure tuned RF
level. Measuring receiver will indicate between -80.9 and -88.9 dBm, if not perform b (3) below.
(19) Disconnect measuring receiver sensor module from calibration antenna No. 1
(243.0 MHz).
(20) Repeat (4) and (6) above using calibration antenna No. 2 (282.8 MHz).
(21) Set RADIO SELECT switch to PRC-90 (282.8).
(22) Connect measuring receiver sensor module to calibration antenna No. 2
(282.8 MHz).
(23) Press REC TEST PRESS button. Set measuring receiver to measure tuned RF
level. Measuring receiver will indicate between -80.9 and -88.9 dBm, if not perform b (4) below.
(28) Disconnect measuring receiver sensor module from calibration antenna No. 2
(282.8 MHz).
b. Adjustments
(1) Press and hold REC TEST PRESS button while adjusting 3L42 (fig. 6) for a
measuring receiver indication between 242.997 and 243.003 MHz (R).
(2) Press and hold REC TEST PRESS button while adjusting 3L12 (fig. 6) for a
measuring receiver indication between 282.796 and 282.804 MHz (R).
(3) Press REC TEST PRESS button while adjusting 3R46 (fig. 6) for a
measuring receiver indication between -80.9 and -88.9 dBm (R).
(4) Press REC TEST PRESS button while adjusting 3R16 (fig. 6) for a
measuring receiver indication between -80.9 and -88.9 dBm (R)