Volume 1
MIL.-HDBK- 162A
Section 1
15 December 1965
ITEM NAME: INTERROGATOR SET
TYPE: AN/GPX-18B
Horizontal Beam Width: 3 deg
radar PPI in close association to the radar targets being
Vertical Beam Width: 10 deg
identified. Also provision is made for symbolic display
Receiver Bandwidth: 8 to 11 mc at 6
of the mode 2 response codes from Transponder Set
db down, broad band; 5 mc at 70 db
AN/APX-25.
down, narrow band.
Receiver Intermediate Frequency: 60 mc
Type of Presentation: PPI of associated
RELATION TO SIMILAR EQUIPMENT
radar.
Operating Voltage and Power Require-
Similar to and interchangeable with AN/GPX-18A,
ments:
differs only in the coder-decoder group being
115v ac, 60 or 100 cps, single-ph.
transistoried. The AN/GPX-18C is similar to and one
way interchangeable with AN/GPX-18B.
Differs in
INSTALLATION CONSIDERATIONS
improved Coder-Decoder Group AN/GPA-78 being
used.
Siting: Dependent on physical location of associated
radar. Limitations on component location are those
TECHNICAL DESCRIPTION
imposed by the designed lengths of the furnished
cables.
Transmitting Frequency: 990 to 10,10 mc
Receiving Frequency: 106t0 to 1130 mc
Mounting:
Components of this equipment are
Peak Power Output: 1.5 kw (min)
installed on the associated radar.
Pulse Width: I usec
Pulse Repetition Rate: 180 to 120 pps
Cabling Requirements:
Some interconnecting
(adjusted to conform with prr of
facilities are furnished as part of AN/GPX-18B,
associated radar)
others are modification of AN/MPS-11II furnished
Number of Modes: 3
cables.
Number of Codes: 32 SI, 400 PI, 61 TI
Range: Range of associated radar
Related Equipments:
Radar Identification Set
Antenna: Reflector type of associated
AN/GPX-18B may h)( used with Radar Set AN/MPS-
radar
11.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
Coder-Decoder Group
1
OA-1272/GPX-IBB
Recognition Set AN/UPX-6
1
Antenna Group OA-105/FPS-8
1
Interconnecting Cable
Assemblies
REFERENCE DATA AND LITERATURE
TECHNICAL ORDERS:
31P,1-2GPX-101, 31P4-2GPX-101, 31P.1-2GPX-13,1, 31P4-2GPX-16,4, 31P4-2GPX-174,
31P4-2GPX-IBI, 31P4-2GPX-194, 31P,1-2GPX-506, 31P1-2GPXI1-1, 31P1-2(;PXIB-14,
31P4-2GPX18-241
AN/GPX-18B: 2
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