Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
SC-4
Range Accuracy: +100 yd
FUNCTIONAL DESCRIPTION
Sweep Accuracy: 20 mi
Range, Min: 1, 200 yd
Radar Equipment SC-4 is an early warning or long-
Type of Presentation:
range search radar, primarily intended for the detection
Range - 5-in. A-scope, range step and counter
of aircraft. Data is presented on both an A-scope and a
scales 20, 80, and 400 mi
PPI. Provision is made for connection to remote PPI's
Bearing - True and relative bearing dials
and to IFF equipment. The SC-4 can be operated from
PPI - 12-in. master, 20, 80, and 200 mi
any of the usual ship's power sources.
IF. Frequency: 15 mc
IF. Bandpass: 0.43 mc
RELATION TO SIMILAR EQUIPMENT
Video Bandpass: 0.5 mc
Receiver Noise: 6 db above theoretical
The SC-4 is similar functionally to the SA series
Receiver Gain: 160 db
equipments, the SK series equipments, and to the other
Receiver Sensitivity: 1 v for 1.1 signal-to-
equipments of the SC series. Many of the component
noise ratio; sensitivity time control reduces
units of these equipments are interchangeable.
gain for ranges of 8, 000 to 12, 000 yd
Antenna Type: Dipole, end-fed half-wave
TECHNICAL DESCRIPTION
Antenna Gain: 13.5 db
Reflector: Rectangular mattress
Frequency: 195 to 205 and 215 to 225 mc
Antenna Feed: Coaxial
Peak Power Output: 200 kw
Polarization: Horizontal
Pulse Repetition Rate: 60 pps
Pulse Width: 5 sec
Vertical Beam Width: 60 deg
Horizontal Beam Width: 17 deg
Operating Voltages and Power Requirements:
230/460v, 60cps, 1-ph, 3.7kw or 115/230 vdc,
INSTALLATION CONSIDERATIONS
4.4 kw
Maximum Reliable Range:
Siting:
Bombers - 90 mi at 30, 000 ft; 60 mi at 10, 000 ft
Mounting: Radar units should not be mounted on
Fighters - 40 mi at 10, 000 ft
outboard bulkheads. Inboard bulkheads may
Battleships - 12 mi
be used if they are braced to prevent vibra-
Cruisers - 12 mi
tion from gunfire.
Destroyers - 10 mi
Cabling Requirements: Cables must have enough
Submarines - 3 mi when surfaced
slack to allow units to slide in and out of case.
Range Resolution: 500 yd
Related Equipment:
Azimuth Resolution: 10 deg
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Transmitter NT-52ADB
1
64-11/16
19-9/16
20-1/4
334
Receiver-Indicator NT-46ADG
1
22-9/16
21-27/32
21-7/8
253
including Receiver NT-46ACQ-1
Control Unit NT-23AEZ
1
22-9/16
13-3/8
21-9/16
125
Plan Position Indicator NT-55AEX
1
43
37-1/16
42-13/16
800
Antenna Assembly NT-66AET-1 or
1
180
43-1/2
91-1/16
590
NT-66AEU-1
Transformer NT-30AAK
1
20-1/4
7-21/32
9-1/16
135
REFERENCE DATA AND LITERATURE
Technical Manual:
NAVSHIPS 900, 866
SC-4: 2
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