Volume 1
MIL-HDBK-162A
Section 1
15 December 1965
ITEM NAME: INTERROGATOR SET
TYPE: AN/GPX-20B
117 or 125v ac, 60 or 400 cps, single ph,
permitting the reply pulses to be displayed on the
250 w
associated radar PPI in close association to the radar
Type of Presentation: PPI's of associated radar.
target being identified. Provisions are also made for
Pulse Repetition Rate: 125 to 1500 (adjusted to
symbolic display of Mode 2 response codes from
conform with associated radar).
Transponder Set AN/APX-25.
Pulse Width: 1 usec
Number of Nodes: 3
RELATION TO SIMILAR EQUIPMENT
Horizontal Beam Width: 4.5 deg
AN/GPX-20B is similar to and one-way
Vertical Beam Width: 30 deg
interchangeable with Interrogator Set AN/GPX-20.
Frequency (if.): 60 mc
Differs in that AN/GPX-20 will interrogate Transponder
Bandwidth: 5 mc (-70 db)
AN/APX-6, where as the AN/GPX-20B will interrogate
the AN/APX6 and AN/APX-25. AN/GPX-2OB is similar
INSTALLATION CONSIDERATIONS
to and interchangeable with Interrogator Set AN/GPX-
Siting: The location of the operating site of
20A, the difference being AN/GPX-2OB is smaller and
Radar Set AN/MPS-7 will in all cases be
weighs less through use of a different Coder-Decoder
suitable.
Group.
Mounting: Components of this equipment are
TECHNICAL DESCRIPTION
mounted on the associated Radar Set
AN/MPS-7 and within the operations
Transmitting 900 to 1040 *c
shelter.
Receiving 10680 to 1130 mc
Range: Same as associated radar
Related Equipments: Interrogator Set AN/GPX-
Peak Power Output: 1.5 kw (min) Operating
20B is primarily used with Radar Set
Voltages and Power Requirements: 105,
AN/MPS-7.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Coder-Decoder Group
1
OA-1271/GPX-2OB
Antenna AS-295A/UPb
1
13-13/32
9-13/32
222
101
Radar Recognition Set
1
11
15
21
77
AN/UPX-60
Electrical Equipment Cabinet
1
24-1/2
23-1/2
26
58
CY-1312/UPX6*
Radar Set Control
1
4-1/2
4-3/4
6-1/4
1.4
C-1315/MPS-70
Interconnecting Box
1
6
3
4-1/2
2.5
J-571/MPS-7*
* Government furnished equipment.
REFERENCE DATA AND LITERATURE
TECHNICAL ORDERS:
31P4-2GPX20- Series
AN/GPX-20B: 2
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