TB 9-6625-2171-24
Paragraph
Page
Equipment setup ............................................
RF frequency accuracy ...................................
RF level output ...............................................
VOR modulation .............................................
VOR 9960 FM deviation ................................
VOR zero .........................................................
LOC DDM .......................................................
LOC modulation .............................................
Glide slope DDM ............................................
Glide slope modulation ..................................
MKR BCN ........................................................
Final procedure ..............................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Radio Test Set, TS3951/PRM34, Receiver Test Set AN/ARM-186, and Collins,
Model 972Q-4. TM 11-6625-3015-14 and TM 11-6625-2976-40 were used as the prime data
sources in compiling these instructions. The equipment being calibrated will be referred to
as the TI (test instrument) throughout this bulletin.
a. Model Variations. None.
b. Time and Technique. The time required for this calibration is approximately 2
hours for TS3951/PRM34, using the dc and low frequency and microwave technique, and 4
hours for AN/ARM-186 and Collins, Model 972Q-4, using the dc and low frequency
technique.
2. Forms, Records, and Reports
a. Forms, records, and reports required for calibration personnel at all levels are
prescribed by TB 750-25.
b. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables, the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument
parameters
Performance specifications
TS3951/PRM34
RF output level
FOR SERIAL #1 thru 634
-97 dBm from 30 to 75 MHz
Accuracy: -3, +3 dBm
FOR SERIAL #635 AND UP
-97 dBm from 30 to 80 MHz
Accuracy: -2, +4 dBm
Frequency measurement
Range: 30 to 80 MHz
Accuracy: r2 kHz
