Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: ANTENNA GROUP
TYPE: AN/SPA-45A
Broadside Frequency: 3000 mc
RELATION TO SIMILAR EQUIPMENT
Gain: 33.5 db relative to an isotropic radiator at
None.
3050.6 mc
Beamwidth in Elevation: 3 deg
TECHNICAL DESCRIPTION
Beamwidth in Azimuth: 2.4 deg
Antenna Rotation Rate
Side Lobes in Elevation: -20 db with respect to the
Normal: 15 rpm
main beam.
With MTI: 11.5 rpm
Side Lobes in Azimuth: -16 db for the first pair; -20
For Testing: 30 rpm
db for all others.
For Coincident Video: 4.8 rpm
Ambient Temperature: -55 deg to plus 150 deg C (-
Antenna
67 deg to plus 302 deg F).
Reflector: Parabolic cylinder section tilted 25 deg
INSTALLATION CONSIDERATIONS
from the vertical.
Primary Feed: Folded rectangular waveguide.
Not available.
Transit Time For rf Energy Between First and Last
Slots: 0.166 usec
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
BOXES
OVERALL DIMENSIONS
UNIT WT.
(NR.)
(Inches)
(Pounds)
Antenna AS-999/SPS
1
95 x 124 x 152
3000
Antenna Pedestal AB-592A/SPS
1
55 x 60 x 60
1600
EQUIPMENT SUPPLIED DATA
COMPONENTS
QTY
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Antenna Group AN/SPA-45A includes:
1
92 x 110 x 184
2475
Antenna AS-999/SPS
1
92 x 110 x 141
Antenna Pedestal AB-592A/SPS
1
43 x 54 x 54
Assembly, Rotary Coupler & Waveguide
1
Segments Hughes Part No. 517623
Elbow-Lower Rotating 3oint Hughes
1
Part No. 517996
Tube, Waveguide Antenna Feed
1
Hughes Part No. 585178
Connector and Cable Hughes Part No.
585610
REFERENCE DATA AND LITERATURE
Technical Manuals:
NAVSHIPS 93273(A)
AN/SPA-45A: 2
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