Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/SPS-21A
Number of Bands: 1 band
RELATION TO SIMILAR EQUIPMENT
Operating Frequency Range
The AN/SPS-21A is similar to and interchangeable with
Transmitter and Receiver: 5550 to 5600 mc.
Radar Set AN/SPS-21 except each unit has minor
Power Supply Characteristics
modifications.
Voltage: 104 to 126v
Frequency: 58 to 62 cycles.
TECHNICAL DESCRIPTION
Phase: Single.
Maximum Starting Current: 10 amps
Type of Frequency Control: Pulse-Modulated
Standby Current: 2 amps
Magnetron Oscillator.
Running Current: 6.56 amps
Peak Power Output: 10 kw
Estimated Power: 607w
Type of Emission: Pulse (0.19 usec).
Power Factor: 80.4%
Pulse Rate: 1500 pps
Type of Receiver: Superheterodyne
INSTALLATION CONSIDERATIONS
Intermediate Frequency: 45 mc
Bandwidth: 11 mc
Not available.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
SHIPPING DATA
COMPONENT
BOXES
OVERALL DIMENSIONS
UNIT WT.
(NR)
(Inches)
(Pounds)
Antenna Pedestal AS-710A/SPS-21
1
26 x 36 x 37
237
Reflector
1
36 x 39 x 104
298
Radar Receiver-Transmitter RT-321A/SPS-21
1
23 x 26 x 31
107
Control Indicator C-1438A/SPS-21
1
25 x 28 x 41
217
Set of Miscellaneous Interconnection
1
18 x 21 x 32
93
Material
Waveguide RG-49/U
1
5 x 5 x 174
72
Set of Equipment Spares
1
24 x 24 x 36
83
Set of Equipment Spares
1
25 x 28 x 41
207
EQUIPMENT SUPPLIED DATA
COMPONENTS
QTY
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Antenna Pedestal AS-710A/SPS-21
1
16 x 19 x 27
122
Reflector
1
33 x 48 x 93
47
Radar Receiver-Transmitter RT-321A/SPS-21
1
19 x 20 x 20
53
Control Indicator C-1438A/SPS-21
1
16 x 17 x 28
103
Waveguide RG-49/U
1
50
REFERENCE DATA AND LITERATURE
Technical Manuals:
NAVSHIPS 92284(A): for Radar Set AN/SPS-21.
Nomenclature Card for Radar Set AN/SPS-21A.
4N/SPS-21A: 2
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