TB 9-6625-2197-40
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
1. Test Instrument Identification.
calibration of Transponder Set Test Set, AN/APM-424(V)2. TM 11-6625-3090-12&P,
TO 33K3-4-2923-1 and NAVAIR 17-20AX-517 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 6
hours, using the microwave technique and techniques as described in text.
2. Forms, Records, and Reports. Forms, records and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration Description. TI parameters and performance applications which pertain
to this calibration are in table 1.
Table 1. Calibration Description.
Test instrument parameters
Performance specifications
Transmit pulse width
Modes 1, 2, 3, C Sum
s
0.1 s
0.8
Modes 1, 2, 3, C Diff
0.8
s
0.1 s
Mode 4 Sum
0.5
s
0.1 s
Mode 4 Diff
0.5
s
0.1 s
Transmit pulse spacing
Mode 1 Sum
s
0.2 s
3
Mode 2 Sum
5
s
0.2 s
Mode 3 Sum
8
s
0.2 s
Mode C Sum
21
s
0.2 s
Mode 4 Sum
2
s
0.2 s
(Burst)
ISLS pulse spacing
Mode 1, Sum to Diff
s
0.15 s
2
Mode 2, Sum to Diff
2
s
0.15 s
Mode 3, Sum to Diff
2
s
0.15 s
Mode C, Sum to Diff
2
s
0.15 s
Transmitter power output
Mode 4, Sum
4
dBm
2 dBm
Mode 4, Diff
-2
dBm
2 dBm
Droop 10% of average
amplitude
Modes 1, 2, 3, C, 4 Diff
1030
MHz 0.02%
Receiver sensitivity
-24 dBm 2 dBm
Receiver bandwidth
1090 MHz 3 MHz