MIL-HDBK-162A
Volume 1
15 December 1965
Section 3
DATE: 1 July 1964
NAME: RADAR SET
COGNIZANT SERVICE: USN
TYPE: AN/SPS-21
FEDERAL STOCK NUMBER: 5840-669-8729
USA
USN
USAF
USMC
STATUS OR TYPE CLASSIFICATION-
Sub Std
Mfg(a) Name or Code Number: Raytheon Manufacturing Company
FUNCTIONAL DESCRIPTION
AN/SPS-21 is a surface scanning, short range, low-
power, lightweight equipment.
It is designed for
installation in small vessels where space is at a
premium and on larger vessels where a second radar is
needed as a standby navigational aid.
RELATION TO SIMILAR EQUIPMENT
None.
TECHNICAL DESCRIPTION
Frequency: 5500 to 5600 mc
Range, Max: 16 mi
Range, Min: 75 yd
Peak Power Output: 10 kw
Pulse Repetition Rate: 1,500 pps
Pulse Duration: 0.19 sec
Type of Presentation: PPI (10-in. CRT)
Operating Voltages and Power Requirements:
104 to 126v, 58 to 62 cps, 1-ph, 10 amp start-
ing current, 2 amp standby current, 6.5
amp operating current, 607w, 0.804 pf
Antenna Type: Parabolic
Antenna Input Impedance: 466 ohms
Antenna Feed: Waveguide
Horizontal Beam Width: 2 deg 3 db down
Vertical Beam Width: 15 deg 3 db down
IF. Frequency: 45 mc
Number and Interval of Range Markers:
Range Scale No. of Markers
Interval
(miles)
(miles)
1
2
0.5
2
4
0.5
4
4
1.0
8
4
2.0
16
4
4.0
INSTALLATION CONSIDERATIONS
Siting: The antenna and radar receiver-transmitter
are watertight and may be sited in exposed
AN/SPS-21: 1
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