TB 9-6625-2197-50
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
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.
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).
to this calibration are in table 1.
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
s
0.1 s
0.8
Mode 4 Sum
s
0.1 s
0.5
Mode 4 Diff
s
0.1 s
0.5
Transmit pulse spacing
Mode 1 Sum
s
0.2 s
3
Mode 2 Sum
s
0.2 s
5
Mode 3 Sum
s
0.2 s
8
Mode C Sum
s
0.2 s
21
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
s
0.15 s
2
Mode 3, Sum to Diff
s
0.15 s
2
Mode C, Sum to Diff
s
0.15 s
2
Transmitter power output
Mode 4, Sum
+ 2 dBm
4
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
