Volume 1
MIL-HDBK-162A
Section 1
15 December 1965
ITEM NAME: RADAR SET GROUP
TYPE: AN/GPA-50
air-supported radome covers the top floor to give
INSTALLATION CONSIDERATIONS
complete protection of the radar antenna against the
Siting: The arctic tower requires the area contained
wind, humidity, and icing conditions to be expected in
within a circle that is 70 feet in diameter. The site
arctic installations. The Radar Set Group includes
should be such that the line-of-sight beam path of
automatic pressurizing and dehumidifying equipment
the radar equipment is not obstructed or dispersed
that pressurizes the radome in accordance with the
by mountains, hills, buildings, or wooded areas. The
external wind conditions, that dehumidifies the air within
terrain must be reasonably level. Marsh land, soft
the radome. Radiant heaters, with manual control, are
clay, and loose, sandy soils should be avoided.
supplied for de-icing the outer surface of the radome.
Mounting: Except for the pressurizing blowers and the
two dehumidifiers, the placement of the Radar Set
RELATION TO SIMILAR EQUIPMENT
Group components is not critical.
Cabling
Requirements:
Maximum
spacing
of
The AN/GPA-50 is replaced by Radome-Tower
components is solely determined by intercomponent
Group AN/GPA-89.
cable length. The Radar Set Group requires only
external power connections, for which bulk cable is
TECHNICAL DESCRIPTION
supplied.
The interconnecting cables that are
The AN/GPA-50 is unaffected by temperature within the
supplied with the radar equipment are long enough
range from minus 540C to plus 710C (minus 65 F to
to allow a wide choice of locations of the arctic
1600F).
With the radome fully pressurized, the
tower with respect to the operating buildings housing
AN/GPA-50 can withstand wind velocities up to 125
the associated radar equipment.
knots. The radome, at wind velocities below 60 knots,
Related Equipments: Radar Set Group AN/GPA-50 is
can support a two-inch thickness of ice. The radome
designed to support and house the antenna and
material absorbs less than 10 percent of the radiated
cabinets of Radar Set AN/FPS-6.
power, and does not introduce serious diffraction errors
in either beam angle or beam dispersion.
PRINCIPAL CO!PONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Tower AB-259A/FPS-6
1
Radome CW-208C/CPS-6B
1
Case CY-895/CPS-6B
1
Control, Inflation, Radome
1
C-1034/FPS-6
Switch Box SA-224/CPS-6B
1
Interconnecting Box J-500/FPS-6
1
Relief Valve HD-77/CPS-6B
Wind Instrument Support
1
MT-793/CPS-6B
Dehumidifier, Desiccant,
2
Electric, HD-212/FPS-8
Electric Space Heater
5
HD-85/CPS-6B
Electric Space Heater
4
HD-86/CPS-6B
AN/GPA-50: 2
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