MIL-HDBK-162A
Volume 1
15 December 1965
Section 1
ITEM NAME: RADAR SET
TYPE: AN/CPN-18, AN/CPN-18A, AN/CPN-18C, AN/CPN-18D
Accuracy
certain aircraft within the radar coverage area and of
Range: 2 pet
tracking these aircraft at distances too great to permit
Azimuth: 2 deg
tracking them with the radar system alone.
Resolution
Range: 1000 ft
RELATION TO SIMILAR EQUIPMENT
Azimuth: 1.5 to 3.0 deg
Antenna Polarization: Linear or circular
Radar Set AN/CPN-18D is similar to and one-way
Antenna Rotation: 10 rpm clockwise only
interchangeable with AN/CPN-18, 18A, 18C. Differs in
Power Requirements: 120v ac, 60 cps,
that AN/CPN-IBD is modified per T.O. 31P5-2CPN18-
3 ph, 10.4 kw supplied from commercial
539.
or 15 kw generators.
Radar Set AN/CPN-18C is similar to and
INSTALLATION CONSIDERATIONS
functionally interchangeable with AN/CPN-18A. Differs
in that Indicator Group OA-348/CPN-IBA is replaced by
Siting: The site must be large enough to accommodate
Indicator Group OA-2238/CPN-18C and range is
the operations shelter, power shelter, tower and
increased to 200 miles. AN/CPN-18C is a composite of
winch. The foundation for the operations building
AN/CPN-18 and AN/CPN-18A.
and the foundation for the tower must be on the
same level. The area must have adequate water
Radar Set AN/CPN-18 is similar to AN/CPN-4 and
sanitation and good drainage. The ground must be
AN/MPN-11 differs in that AN/CPN-18 does not include
high enough above the average terrain to prevent
the precision portion of equipment and is not trailer
excessive ground clutter. Recommended Plot Size
mounted.
is: 90 x 130 feet.
TECHNICAL DESCRIPTION
Mounting: All equipment is mounted within the
operations shelter and power shelter with the
Frequency: 2700 - 2900 mc
exception of the antenna which is mounted on the
Pulse Width: 0.5 usec (1.0 usec in modified sets)
tower.
Pulse Repetition Rate: 1500 pps (900 pps
in modified sets)
Cabling Requirements: No special power or cabling
Transmitter Peak Power Output: 500 kw min
considerations are applicable to Radar Set AN/CPN-
Receiver Sensitivity: 95 dbm min
18, 18A, 18C, 18D.
Receiver Noise Figure: 9.5 db max
Receiver Outputs: Normal video and MTI video
Related Equipments: Electronic Mapping Groups
Range: 53 naut mi (70 naut mi for modified sets)
AN/GPA-5 or Video Mapping Group AN/GPA-30,
Interference Blanker Group AN/GPA-28, Radar
Identification Set AN/GPX-9.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
Operations Shelter S-63/CPN-18
1
96
156
192
Power Shelter S-64/CPN-18
1
96
156
192
Modulator Group OA-170/CPN-18
1
32
22
23-3/4
350
Modulator Power Supply Group
1
40
28
28-3/4
700
OA-223/CPN-18
Transmitter Group OA-181/CPN-18
1
40
22
23-3/4
400
Rotary Coupler CU-237/CPN-18
1
6-13/16
8-3/4
11-1/4
Rotary Coupler CU-237/CPN-18
7-1/2
7-1/2
8-5/8
Radar Set Group OA-703/CPN-18
1
Antenna Reflector AT-260B/CPN-18
1
96
240
AN/CPN-18: 2
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