Volume 1
MIL-HDBK- 162A
Section 3
15 December 1965
head by means of two shock mounts at the up-
AN/SPA-4, -4A, -4B
per rear of the unit.
Tilted Mounting: As much as 45 deg forward
Range Strobe Accuracy: 1% of range scale
slanting allowed. Equipment must be perma-
Azimuth Accuracy: 2 deg for 1-speed;
nently attached to a support tilted the same
1 deg for 1- and 36-speed
angle as the equipment.
Sweep Accuracy: 1% from 1- to 20-mi range;
Cabling Requirements: Video and trigger cables
2% from 20- to 250- or 300-mi range
must have a characteristic impedance of 75
ohms. The rear cable entrance hole is not
INSTALLATION CONSIDERATIONS
available when Air Exchange Valve MX- 1478/
SPA-4A is used.
Siting: If open bridge or weather exposed site is
Related Equipment: Designed for use with any
used, Air Exchange Valve MX- 1478/SPA-4A
standard Navy search radar system having a
is needed.
prf between 140 and 3, 000 pps.
Vertical Mounting: Bottom shock mounts must
be bolted to a horizontal deck or surface. If
practical, further secure equipment to bulk-
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Range-Azimuth Indicator
1
37-15/16
21-3/4
18
342
ID-302/SPA-4
Range-Azimuth Indicator
1
38
21
19
366
AN/SPA-4A
Range-Azimuth Indicator
1
39
21
19
400
AN/SPA-4B
REFERENCE DATA AND LITERATURE
Technical Manuals:
NAVSHIPS 91659
NAVSHIPS 91825(B)
NAVSHIPS 92942(A)
AN/S PA-4: 2
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