Volume 1
MIL-HDBK- 162A
Section 1
15 December 1965
ITEM NAME: RADAR IDENTIFICATION SET
TYPE: AN/GPX-7A
Receiving Frequency: 10lO to 1130 mc
video pulses. The equipment permits the video pulses to
Peak Power Output: 1.5 kw
be displayed on the plan position indicators of the
Pulse Width: 1 usec
associated radar set or supplies the video pulses to SIF
Pulse Repetition Rate: 180 to 420 pps (adjusts to
Coder-Decoder Group OA-Bl40/GPX-7A. The OA-IO0/
conform to prr of associated radar)
GPX-7A supplies coded pulses for security identity,
Number of Modes: 3
personnel identity, and traffic identity. The set decodes
Number of Codes: 32 SI, 400 PI, 64 TI
multiple-pulse response codes transmitted by airborne
Antenna Type: Dipole (24 radiating slots)
equipment in reply to interrogations or challenges and
Beam Width: 4.5 deg horiz; 30 deg vertical
supplies the video reply signals to the indicators of the
Receiver Bandwidth: B to 11mc, broad band at 6 db
associated radar. The interrogator output level and
down; 5 mc, narrow band at 70 db down.
receiver sensitivity are adequate for interrogating and
Receiver Intermediate Frequency: 60 mc
receiving replies from trans1ponders operating within
Type of Presentation: PPI of associated radar
the detection range of the associated radar. The
Operating Voltages and Power Requirements: 115v ac,
AN/GPX-7A may be independently operated to track
60 or 400 cps, 1-ph, 4 kw
targets equipped with a radar identification set.
Range: Range of associated radar
INSTALLATION CONSIDERATIONS:
RELATION TO SIMILAR EQUIPMENT:
The AN/GPX-7A is used with the SIF Coder-
Siting: Physically located with associated radar set.
Decoder Group OA-UIO/GPX-7A. The AN/GPX-7 is not.
Mounting: Components of the AN/GPX-7A are
mounted on Radar Set AN/FPS-3A.
TECHNICAL DESCRIPTION
Related Equipment: AN/FPS-3, -3A and other
Transmitting Frequency: 990 to 1040 mc
models of AN/FPS-3 equipment.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
Video Decoder KY-118l/GPX
7
28-3/16
18
13
161
Video Decoder KY-119/GPX
2
26-3/16
18
13
96
Interrogator Set Coder
1
21-3/16
1B
13
121
KY-120/GPX
Electronic Gate TD-9'1/GPX
1
28-3/16
18
13
93
Coder Control C-12Bcl/GPX
1
6-3/16
6-3/16
6-7/16
4
Remote Switching Control
6
6-3/16
6-3/16
6-15/16
1
C-1289/GPX
Remote Switching Control
6
6-3/16
6-3/16
6-3/4
3
C-1290/GPX
Video Coder Group C-1291/GPX
1
3-13/32
5-3/4
6-3/32
1-1/2
Electrical Frequency Control
1
8
17
6-1/2
C-202B/GPX
Interconnecting Box J-66-/GPX
2
3
13-1/16
7-1/8
5-1/2
Mounting MT-1501/GPX
6
18-1/2
19-13/16
3/16
6
Electrical Equipment Rack
6
75-5/8
18-3/8
30
132
MT-1502/GPX
AN/GPX-7A: 2
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