15 December 1965
ITEM NAME: RADIO INTERROGATOR SET
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
radar identification set.
Type of Presentation: PPI's of associated radar
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
AN/GPX-20B is smaller and weighs less.
Band Width: 5 mc (-70 db)
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
and 400 cps operation except the blower
PRINCIPAL COMPONENTS AND PHYSICAL DATA
Radar Recognition Set
Switch Box SA-239/GPX
Code Coordinator KY-54/GPX*
Electrical Equipment Cabinet
Radar Set Control C-1315/MPS-7
Interconnecting Box J-571/MPS-7
Blower Conversion Kit
* Government-furnished equipment.
REFERENCE DATA AND LITERATURE