Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
SR-3, -3a, -3b, -3c
Type of Presentation:
FUNCTIONAL DESCRIPTION
Range - 5-in. A-scope; 4, 20, 80, 400 mi; step
expansion is provided except on 400 mi
Radar Equipments SR-3, -3a, -3b, and -3c are
sweep
shipboard equipments that operate within the L-band
Bearing - Relative and true
1250 to 1350 mc. They are capable of detecting surface
Other - A monitor A-scope is provided on 20-
craft and aircraft at long range. They will supply video
mi and 80-mi ranges; provision is made
and sweep trigger voltages for type A and PPI scopes,
for radar repeaters
as well as one-speed bearing data for PPI use.
Antenna 66AMD:
Provision has been made for operating one master PPI
Reflector - V-shaped, stainless steel wave-
and two remote PPI's of the VE or VJ type. The antenna
guide 210 in. long
can be operated either automatically or manually. These
Feed - Waveguide and dipole
equipments include their own echo box, which has a
Horizontal Beam Width - 4 deg
directional coupler and slotted-line assembly. Provision
Vertical Beam Width - 30 deg
is made for integration with the ship's IFF equipment.
Polarization- Horizontal
These equipments are similar except for the types of
Gain - 24 db
antenna used.
Rotation - 360 deg at 2.5 and 5.0 rpm, auto-
matic or manual
Antenna AS-402/SPS-6:
RELATION TO SIMILAR EQUIPMENT
Reflector - Slotted parabolic
Feed - Horn-fed
The SR-3 series radars are similar to the SR-6 series
Horizontal Beam Width - 3.5 deg
and theAN/SPS-6 series. Many of the components are
Vertical Beam Width - 10 deg
interchangeable.
SWR- 1.1 to 1.0
Antenna AS-429A/SPS- 6A:
Reflector - Slotted parabolic
TECHNICAL DESCRIPTION
Feed - Horn-fed
Horizontal Beam Width - 3.5 deg
Frequency: 1250 to 1350 mc
Vertical Beam Width - 20 deg
Peak Power Output: 500 to 750 kw
SWR - 1.1 to 1.0
Pulse Repetition Rate: 150 to 600 pps
Pulse Width: 1 and 4 sec
Antenna AS-430A/SPS-6B
Reflector - Slotted parabolic
Operating Voltages and Power Requirements:
Feed - Horn-fed
115v, 60 cps, 1-ph, 5 kva, 92% pf
Sensitivity: 0.5 to 1 v
Horizontal Beam Width - 3.5 deg
Vertical Beam Width - 30 deg
IF. Frequency: 30 mc
SWR - 1.1 to 1.0
IF. Bandpass: 0.5 and 2.0 mc
Receiver Noise: 14 db above theoretical
INSTALLATION CONSIDERATIONS
Maximum Reliable Range:
Bombers - 100 mi at 10, 000 ft
Siting: Siting of individual components is gov-
Fighters - 80 mi at 10, 000 ft
erned by the type of Naval craft in which the
Battleships - 20 mi
equipment is installed.
Cruisers - 20 mi
Mounting: Components are designed for deck or
Destroyers - 15 mi
bulkhead mounting, as appropriate. Shock
Submarines - 5 mi
mounts are provided for those components
Range Resolution: 200 yd
susceptible to casualty from mechanical
Azimuth Resolution: 1.5 deg
shock.
Range Accuracy: 100 yd
Azimuth Accuracy: 2 deg
Cabling Requirements:
Related Equipment:
Range, Min: 600 yd
SR-3: 2
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