Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
SR-6a, SR-6b
Antenna Polarization: Vertical for IFF antenna,
FUNCTIONAL DESCRIPTION
horizontal for radar antenna
Horizontal Beam Width: 3.5 deg
Radar Equipments SR-6a and SR-6b are shipboard
Vertical Beam Width:
search radars that provide accurate range-azimuth data
AS-402A/SPS-6 - 10 deg
and early warning of approaching surface craft and
AS-429A/SPS-6A - 20 deg, cosecant squared
aircraft. They provide line-of-sight range information that
AS-430A/SPS-6B - 30 deg, cosecant squared
is displayed on the A-scope and the range counter of the
associated range indicator, while relative and true
bearing data is displayed on any PPI scopes being
INSTALLATION CONSIDERATIONS
operated with the equipment.
The SR-6a and SR-6b are identical, differing only in
the type of antenna reflector used.
Siting: As a general rule, locate the IFF coor-
dinator-range indicator, master PPI indica-
tor, and Radar Set Control C-882/SPS in CIC
room; Receiver-Transmitter RT-217/SPS in
RELATION TO SIMILAR EQUIPMENT
a compartment near the mast; Antenna Con-
None.
amplifier, and synchro capacitor unit near
RT-217/SPS, so they can be observed by the
TECHNICAL DESCRIPTION
operator. Allow space for servicing equip-
ment. Follow installation drawings of NAV-
Frequency: 1244 to 1350 mc
SHIPS 900989.1(A) for slide-out chassis
Power Output: 500 to 750 kw
clearances and ventilation requirements.
Pulse Repetition Rate: 300 pps
Pulse Width: 2 sec
Mounting: Mounting holes are drilled at dimen-
sions shown in the outline drawings of NAV-
Operating Voltages and Power Requirements:
SHIPS 900989.1(A).
110 to 120v, 60 cps, 1-ph
Cabling Requirements: Most coaxial lines go
IF. Frequency: 30 mc
directly to terminal boards. Keep solid co-
Antenna Rotation Speed: Automatic, 5 to 10 rpm
axial cables away from steam pipes, hot-air
cw, 10 to 15 rpm cw, 10 rpm cw emergency;
intakes and stack gases. Do not run cables
manual, 2.5 rpm max cw or ccw
through battery charging compartments, gal-
Antenna Feed: Horn
leys, uptake spaces or machinery spaces.
Related Equipment:
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Transmitter-Receiver RT-217/SPS
1
77
35
31
1260
Antenna Control C-491B/SPS-6
1
36
35
21
355
Radar Set Control C-882/SPS
1
25
21
18
100
Range Indicator NT-55AHP-1
1
39
33
24
340
Antenna Mounting AB-146/SPS-6
1
44
34
23
480
Antenna AS-402A/SPS-6
1
210
93
77
396
Antenna AS-429A/SPS-6A
1
204
153-5/8
95-7/8
626
Antenna AS-430A/SPS-6B
1
204
152-13/16
90-1/8
586
REFERENCE DATA AND LITERATURE
Technical Manual:
NAVSHIPS 900, 989(A)
NAVSHIPS 92381
SR-6a: 2
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