Volume 1
MIL-HDBK-162A
Section 1
15 December 1965
AN/GPS-3
Indicator Type and Quantity: 12-in. PPI (Indicator
Tower AB-397/FPS-8 is used with Radar Set AN/GPS-3,
Group OA-99A/CPS-6B), one A-scope type 5CPlA
depending upon environmental conditions. When the
(IP-209/FPS-8)
AN/GPS-3 is used in an arctic installation, the power
Indicator Ranges: OA-99A/CPS-6B has radial sweeps of
requirement is increased by 60 kilowatts.
O0 to 50, 0 to 100, 0 to 200 naut mi, IP-209/FPS-
RELATION TO SIMILAR EQUIPMENT
8 has 1. 62- to 250-naut mi indicator calibration
Range Marks: 10-mi intervals, every fifth mark
None.
accentuated
TECHNICAL DESCRIPTION
Angle Marks:
10-deg intervals, every third mark
accentuated
Frequency: 1280 to 1350 mc
Duty Cycle: 0.00108
Peak Power Output: 1 megw
AN/GPS- 3 Loading Conditions: 52-knot wind velocity
Pulse Width: 3 psec
without antenna reflector ice load
Pulse Repetition Rate: 360 pps
Power Requirements: 120/208vac, 60cps, 3-ph,
Range Limits:
4-wire
Normal - 160 naut mi (without delay)
Temperature - 16. 9 kva
Normal - 220 naut mi (with delay)
Arctic - 76. 9 kva
MTI - 150 naut mi
Azimuth Coverage: 360 deg, continuous rotation in
INSTALLATION CONSIDERATIONS
either forward or reverse direction, and sector
Siting: For optimum performance, use the highest
scanning in individual sectors of 40 to 120 deg
available location separated from an atmospheric
Range Accuracy: +0. 5 mi
duct by a minimum of 2, 000 feet, from adjacent
Azimuth Accuracy: 0*. 5 deg
radar sets by a minimum of 100 feet, and from
Rate of Antenna Rotation: 0 to 10 rpm cw or ccw
any refueling operation by a minimum of 500 feet.
Reflector Dimensions: Paraboloidal, 14 ft high and
Mounting: Radar units will be positioned on the first
25 ft long
deck cubicle floor platform, 16 ft above ground
Beam Width: 2. 5 deg
level; the antenna reflector elements are to be
Beam Pattern: Cosecant-squared, from 9 to 30-deg
positioned on the top platform level, 25ft above
elevation
ground, on Tower AB-397/FPS-8.
Antenna Gain: 30. 3 db relative to isotropic source
Cabling Requirements: dry locations required.
Receivers: I normal receiver, 1 MTI receiver
Related Equipment: Any long-range radar set having
Normal Receiver Bandwidth: 0.6 0.1 mc
characteristics c o m p a r a b l e to the AN/GPS-
IF. Frequency: 30 mc
3.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Modulator Group OA-414/FPS-8
1
55-1/2
24
24-1/2
Power Supply Group OA-412/FPS-8
1
65
30
28
Radar Transmitter T-370/FPS-8
1
57-1/2
32
24
Receiver Group OA-417/FPS-8
1
50-1/2
33-1/8
27
Radar Set Group OA-416/FPS-8
1
83-9/16
24
29
Radar Set Group OA-381/FPS-8
1
60-3/32
34-3/8
27-3/4
Indicator OA-99A/CPS-6B
1
42
21
43
Power Switchboard SB-245/FPS-8
1
62
20
22-5/8
Electrical Power Switching Group
1
60-1/2
25
32
OA-41 5/FPS-8
AN/GPS-3: 2
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