TB 9-6625-2171-24
CALIBRATION PROCESS FOR RADIO TEST SET, TS3951/PRM34
6. Preliminary instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment and accessories used in this procedure are referenced within the
text by common name as listed in table 2 and 3.
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in TM 11-6625-3015-14 for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable. This unit uses a lithium-
sulfur dioxide battery. Special handling may be necessary IAW
TM 11-6625-3015-14.
a. Remove bottom cover from TI.
b. Disconnect battery from battery connector and connect dual volt power supply
output to battery connector while observing polarity.
c. Connect multimeter to dual volt power supply output and adjust until digital
multimeter indicates +5.5 V dc.
NOTE
Ensure proper calibration factors are loaded for sensor module
being used.
8. RF Output Level
a. Performance Check
(1) Connect spectrum analyzer RF input to TI RADIO connector.
(2) Set MODE switch to SENS SQ and press PUSH-TO-TEST button.
(3) For SN 1 through 634, adjust spectrum analyzer to observe frequencies from 30
to 75 MHz. If output levels do not indicate between -94 and -100 dBm from 30 to 75 MHz,
perform b below. For SN 635 and above, adjust spectrum analyzer to observe frequencies
from 30 to 80 MHz. If output levels do not indicate between -95 and -101 dBm from 30 to
80 MHz, perform b below.