Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: ANTENNA GROUP
TYPE: AN/SPA-21(XN-1)
cps, 3 ph, 15.5 kw max and 5.0 kw
equipment. The power handling capacity of the feed
normal
system is increased to two megawatts (peak Power) and
the antenna and pedestal is constructed to withstand a
heavier ice and wind loading without impairing the
INSTALLATION CONSIDERATIONS
normal operation of the equipment.
Related Equipment: The AN/SPA-21(XN-1) is
designed to be used with but not part of
RELATION TO SIMILAR EQUIPMENT
the AN/SPS-12 or possibly the AN/SPS-6.
(Equipment Required but not Supplied):
(1) Radar Set AN/SPS-12 excluding
None.
the following units: (1) Control-Power
Supply C-11OO/SPS-12, (1) Antenna Pedes-
TECHNICAL DESCRIPTION
tal AB-276/SPS-12, (1) Rotary Coupler
CU-603/SPS-12, (1) Antenna AS-603/SPS-1l
Heat Dissipation: 250w
(1) Master PPI and Instruction Book,
Operating Frequency: 1250 to 1350 mc
(1) DG Synchro Amplifier and Instruction
Peak Power Output: 2 megw
Book AM-421/U, (1) Range Calibrator and
Operating Power Requirements: 440v ac, 60
Instruction Book, (1) PPI Repeater and
Instruction Book.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
SHIPPING DATA
COMPONENT
BOXES
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Antenna Pedestal Unit 2
1
42 x 46 x 92
2610
Antenna Feedhorn and Support
1
32 x 62 x 146
425
P/O Unit 1
Antenna Reflector Support
1
44 x 55 x 59
210
P/O Unit 1
Antenna Reflector Section
1
42 x 98 x 118
370
(Right End) P/O Unit 1
Antenna Reflector Section
1
42 x 98 x 118
370
(Left End) P/O Unit 1
Antenna Reflector Section
1
50 x 102 x 110
450
(Middle) P/O Unit 1
Antenna Control Unit 3
1
27 x 29 x 43
285
Motor-Generator Unit 4
1
30 x 30 x 59
1225
Motor-Generator Maintenance Parts
1
13 x 18 x 29
85
Antenna Pedestal & Antenna Control
1
24 x 24 x 36
75
Maintenance Parts
Antenna Pedestal Maintenance Parts
1
13 x 16 x 23
63
Radar Set Control Modification Kit
1
12 x 12 x 18
50
AN/S PA-21(XN-1): 2
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