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
ohms. The rear cable entrance hole is not
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
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
REFERENCE DATA AND LITERATURE
AN/S PA-4: 2