Volume 1
MIL-HDBK-162A
Section 1
15 December 1965
ITEM NAME: INTERROGATOR SET RADIO
TYPE: AN/GPX-18A
ponder reply to video pulses. The equipment permits
TECHNICAL DESCRIPTION
the video pulses to be displayed on the PPI indicators of
Transmitting Frequency: 990 to 1040 mc
the associated radar set or supplies the video pulses to
Receiving Frequency: 1060 to 1130 mc
SIF Coder-Decoder Group OA-886/GPX-18A. The OA-
Peak Power Output: 1.5 kw (min)
886/GPX-18A supplies coded pulses for security
Pulse Width: 1 usec
identity, personnel identity, and traffic identity. The set
Pulse Repetition Rate: 180 to 420 pps
decodes multiple-pulse response codes transmitted by
(adjusted to conform with prr of associated radar)
airborne equipment in reply to interrogations or
Number of Modes:
3
challenges and supplies video reply signals to the
Number of Codes:
32 SI, 400 PI, 64 TI
indicators of the associated radar. Interrogator output
Range: Range of associated radar
level and receiver sensitivity are adequate for
Antenna: Reflector type of associated radar
interrogating and receiving replies from the
Horizontal Beam Width: 3 deg
transponders operating within the detection range of the
Vertical Beam Width: 10 deg
associated radar.
The AN/GPX-18A may be
Receiver Bandwidth: 8 to 11 mc at 6 db
independently operated to track targets equipped with a
down, broadband; 5 mc at 70 db down, narrow band
radar identification set.
Receiver Intermediate Frequency: 60 mc
Type of Presentation: PPI of associated radar
Operating Voltages and Power Requirements:
RELATION TO SIMILAR EQUIPMENT:
115v ac, 60 or 400 cps, 1-ph
AN/GPX-18A is similar to and interchangeable with
INSTALLATION CONSIDERATIONS:
Interrogator Set AN/GPX-1B. The difference being the
AN/GPX-18A also decodes the response for
Siting: Physically located with associated radar.
Transponder Set AN/APX-25. Difference between the
Mounting: Mounted on the basic radar.
AN/GPX18 and AN/GPX-1BA is that the A-mode uses a
Cabling Requirements:
Some interconnecting
Coder-Decoder Group OA-886/GPX-1BA instead of
facilities are furnished as part of AN/GPX-1BA,
Code Coordinator KY-54/GPX and Switch Box SA-
others are modifications of AN/FPS-B or AN/MPS-
239/GPX.
11 furnished cables.
Related Equipment:
Radar Sets AN/FPS-B,
AN/GPX-1BB is similar to and interchangeable with
AN/MPS-11, and other models.
AN/GPX-18A, differs only in the Coder-Decoder Group
being transistorized.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
Video Decoder KY-118/GPX
7
28-3/16
18
13
161
Video Decoder KY-119/GPX
2
28-3/16
18
13
96
Interrogator Set Coder KY-120/GPX
1
28-3/16
1B
13
121
Electronic Gate TD-94/GPX
1
28-3/16
18
13
93
Coder Control C-1288/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
4
C-1289/GPX
Remote Switching Control
6
6-3/16
6-3/16
6-3/4
3
C-1290/GPX
Video Decoder Group C-1291/GPX
1
3-13/32
5-3/4
6-3/32
1.5
Interconnecting Box J-664/GPX
2
3
13-1/16
7-1/8
5.5
Mounting MT-1501/GPX
6
18-1/2
19-3/16
3/16
6
Electrical Equipment Rack
6
73-5/8
18
30
132
MT-1502/GPX
AN/GPX-18A: 2
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