Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: TRANSPONDER SET
TYPE: AN/APX-25A
RELATION TO SIMILAR EQUIPMENT
Transmitting: 1090 mc
Intermediate Frequency: 59.5 mc plus or
The AN/APX-25A is similar to AN/APX-6,
minus 1.5 mc
and replaces the AN/APX-25.
Output Power (For either Mark X (norm) or
SIF (Mod) operation): Transmitter de-
livers between 24 and 30 db above 1w
TECHNICAL DESCRIPTION
R-F peak power to a 51 ohm antenna
termination.
Power Requirements
ac: 105 to 124v root-mean-square,
320 to 1760 cps, 220w max
INSTALLATION CONSIDERATIONS
dc: 24 to 29v, 30w at 27.5v
C130, C135, KC135, F105, T-39A & B air-
Receiving: 1030 mc
craft.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Receiver-Transmitter
1
10-1/2
13-3/16
12-5/8
38
RT-279/APX
Transponder Set Control
1
4-5/8
5-3/4
3
1-1/4
C-1158/APX
Antenna Assy 1 9-13/32 3-11/64 7-3/16 1
***AS-133/APX or AT-234/APX
Mounting MT-362A/A
1
12-1/4
9-3/4
2-5/16
3-1/2
Transponder Set Coder
1
10-5/8
5-3/16
7-3/4
13-1/2
KY-95/APX-25 or
KY-95A/APX-25
10-11/16
5-1/8
7-5/8
9-1/2
Mounting MT-1151/APX-25
1
11-1/2
6-1/8
2-1/8
1
Filter, Radio Interference
1
4-5/8
1-1/2
1-3/16
1/2
F-245/APX-25
NOTE: ***Type used dependent upon aircraft installation.
REFERENCE DATA AND LITERATURE
Technical Manuals:
Specifications:
12P4-1-1
MIL-C-25341A
12P4-2APX25- Series
MIL-T-25036
MIL-T-25348
MIL-M-25460A
MIL-C-8327A
AN/APX-25A: 2
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