Volume 1
MIL-HDBK-162A
Section 1
15 December 1965
ITEM NAME: RADIO INTERROGATOR SET
TYPE: AN/GPX-20
system, which must be installed for either
the associated radar.
The AN/GPX-20 may be
60 or 400 cps, depending on the available
independently operated to track targets equipped with a
power frequency).
radar identification set.
Type of Presentation: PPI's of associated radar
set.
RELATION TO SIMILAR EQUIPMENT
Pulse Repetition Rate: 125 to 1500 (adjusted to
The AN/GPX-20A is similar to and interchange
conform with prr of associated radar)
able with Interrogator Set AN/GPX-20, the difference
Pulse Width: 1 usec
being AN/GPX-20A will also decode the response from
Number of Modes: 3
Transponder Set AN/APX-25.
Horizontal Beam Width: 4.5 deg
AN/GPX-20B is similar to and interchangeable
Vertical Beam Width: 30 deg
with Interrogator Set AN/GPX-20A, the difference being
IF. Frequency: 60 mc
AN/GPX-20B is smaller and weighs less.
Band Width: 5 mc (-70 db)
TECHNICAL DESCRIPTION
INSTALLATION CONSIDERATIONS
Frequency: Transmitting, 900 to 1040 mc;
Siting: The location of associated radar site for
receiving, 1080 to 1130 mc
AN/MPS-7 is in all cases suitable.
Range: Range of associated radar
Mounting: Components of this equipment are
Peak Power Output: 1.5 kw (min)
on he associated radar.
Operating Voltages and Power Requirements:
Related Equipment: Radar Identification Set
105, 117 or 125v ac, 60 or 400 cps*, 1-ph,
AN/GPX-20 may be used with Radar Set
250w (*All circuits are designed for both 60
AN/MPS-7.
and 400 cps operation except the blower
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENTS
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Antenna Assembly AS-295/UP
1
13-13/32
9-13/32
222
101
Radar Recognition Set
1
11
15
21
77
AN/UPX-6*
Switch Box SA-239/GPX
5
4-1/4
4-3/4
6-1/4
1.4
Code Coordinator KY-54/GPX*
1
5-5/d
6-5/8
23
39
Electrical Equipment Cabinet
1
24-1/2
23-1/2
26
58
CY-1312/UPX-6*
Radar Set Control C-1315/MPS-7
1
4-1/4
4-3/4
6-1/4
1.4
Interconnecting Box J-571/MPS-7
1
6
3
4-1/2
2.5
Blower Conversion Kit
1
14
14
14
2.5
* Government-furnished equipment.
REFERENCE DATA AND LITERATURE
Technical Orders:
31P4-2GPX-101
31P4-2GPX-121
31P4-2GPX-506
31P4-2GPX20-5
31P4-2GPX20-12
Specification:
ENG-299
AN/GPX-20: 2
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