Volume 1
MIL-HDBK-162A
Section I
15 December 1965
ITEM NAME: ANTENNA ASSEMBLY
TYPE: AS-295/UP, AS-295A/UP, AS-295B/UP
AS-295A/UP - 950 to 1150 mc
The antenna has a fan-shaped beam pattern which has
AS-295B/UP - 1010 to 1110 mc
a high degree of horizontal directivity. The width of the
Peak Power Output: 10 kw
slot in each radiating element Is the height of the
Duty Cycle: 0.0025
aperture. Each feeder system has a flat aluminum
Wind Loading: 740 lb at 90 mph
center conductor. The conductor is suspended between
Temperature Ratings: The antenna will operate
two ground planes b) solid dielectric insulators. The
over the temp) range of -50 deg F to plus 450
feeder line is undercut at support positions. The
deg F
undercutting allows line impedances to remain constant
Polarization: Vertical
through the support area. The characteristic impedance
Radiation Pattern:
of each section is determined by the width of the section
Vertical - Sensitivity decreases as the angle of
required for constant s[pacing between plates.
elevation increases to 90 deg. Above 90 deg
sensitivity drops sharply.
RELATION TO SIMILAR EQUIPMENT
Horizontal - 4 deg (max) at half power points.
Standing Wave Ratio:
3.5 db with 50 ohm
AS-295/UP, AS-295A/UP and AS-295B/'P have
transmission line reference. SWR is less than
minor differences in their feeder systems. The three
1.5 over the useful frequency range.
antenna assemblies are interchangeable, but the feeder
system of the replacement antenna must be modified to
INSTALLATION CONSIDERATIONS
duplicate the feeder system of the antenna being
removed. AS-295/UP, AS-295A'lP and AS-295B/UP are
Sitting: Dependent on location of associated radar.
similar to Antenna Assembly AT-309 and AT-309A.
Mounting: Designed for mounting on an existing
TECHNICAL DESCRIPTION
radar antenna provide suitable brackets and
fixtures are available.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
Antenna Assembly
1
18-5/8
222-5/16
15-3/4l
117
AS-295B/UP
Antenna Assembly
1
13-13/32
222
9-13/32
101
AS-295A/UP
Antenna Assembly
1
AS-295/UP
REFERENCE DATA AND LITERATURE
TECHNICAL ORDERS:
31P4-2GPX131 (AS-295B/UP)
31P4-2GPXI21 (AS-295A/UP)
AS -295/UP: 2
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