Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: ANTENNA GROUP
TYPE: AN/SPA-45
Transit Time For rf Energy Between First and Last
RELATION TO SIMILAR EQUIPMENT
Slots: 0.166 usec
Broadside Frequency: 3000 mc
None.
Gain: 33.5 db relative to an isotropic radiator at
3050.6 mc
TECHNICAL DESCRIPTION
Beamwidth in Elevation: 3 deg
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 or minus 150
Antenna
deg C (-67 deg to plus 302 deg F).
Reflector: Parabolic cylinder section tilted 25 dog
from the vertical.
INSTALLATION CONSIDERATIONS
Primary Feed: Folded rectangular waveguide.
Not available.
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-592/SPS
1
55 x 60 x 60
1600
EQUIPMENT SUPPLIED DATA
COMPONENTS
QTY
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Antenna Group AN/SPA-45 including:
1
92 x 110 x 184
2475
Antenna AS-999/SPS
1
92 x 110 x 141
Antenna Pedestal AB-592/SPS
1
Assembly, Rotary Coupler and Wave-
1
Guide Segments Hughes Part No.
518509
Elbow-Lower Rotating Joint Hughes
1
Part No. 517996
Tube, Waveguide Antenna Feed Hughes
1
Part No. 585278
Connector and Cable Hughes Part No.
1
585610
REFERENCE DATA AND LITERATURE
Technical Manuals:
NAVSHIPS 93273(A)
AN/SPA-45: 2
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