Volume 1
MIL-HDBK-162
Section 2
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/APS-31, AN/APS-31B
Antenna Type: Feed horn radiator and
RELATION TO SIMILAR EQUIPMENT
parabolic reflector
Beam Width
Same as AN/APS-31A except uses Antenna AS-
AS-287/APS-31, AS-287B/APS-31: 3 deg
553/SPS-31B instead of AS-287( )/APS-31; RT-
in azimuth ea side at 3 db points.
247/APS-31B instead of RT-193/APS-31A; and C-
AS-553/APS-31B: 1.5 deg in azimuth
970/APS-31B instead of C-729/APS31A. The AN/APS-
ea side at 3 db points.
31 and -31B are also similar to Radar Sets AN/APS-33
Azimuth Range
and AN/ APS-33A.
AS-287/APS-31, AS-387B/APS-31: 150 to
160 deg wide sector, 50 to 60 deg
TECHNICAL DESCRIPTION
narrow sector.
AS-553/APS-31B: 120 deg wide sector,
Frequency
50 to 60 deg narrow sector
Transmitter: 9375 plus or minus 55 mc
Fast Scanning Speed
Receiver (Search): 9375 plus or minus
AS-287/APS-31, AS-287B/APS-31: 40
55 mc
to 50 looks per minute at 150
Receiver (Beacon): 9310 plus or minus
deg, 90 to 100 looks per minute
3 mc
at 60 deg.
Power Output: 52 kw min
AS-553/APS-31B: 52 to 65 looks per
Video Output Impedance: 95 ohms plus or
minute at 120 deg, 90 to 100 looks
minus 10%
per minute at 60 deg
Noise Output, Max: 5 db
Slow Scanning Speed
Noise Output: 0.5v rms (at full gain)
AS-287/APS-31, AS-287B/APS-31: 16 to
IF. Amplifier Gain: 130 db approx
20 looks per minute at 150 deg,
IF. Frequency: 60 plus or minus 1.25
45 to 55 looks per minute at 60
min
deg.
Pulse Duration: Short pulse, 0.5 usec;
AS-553/APS-31B: 26 to 33 looks per
beacon pulse (MD-60/APS-31) 2.5 usec;
minute at 120 deg, 45 to 55 looks
beacon pulse (MD-60A/APS-31), 2.24
per minute at 60 deg
usec; long pulse (MD-60/APS-31) 5.0
Manual Beam Tile Range: plus 10 to -20
usec; long pulse (MD-60A/APS-31, 4.5
deg
usec
Beam Tilt Stabilization Range: plus 24
Pulse Repetition Frequency: Short pulse,
to -30 deg with manual tile setting
800 pps; beacon pulse, 400 pps; long
of 0 deg.
pulse, 200 pps
Directional Coupler: 25 db fixed
Pulse Repetition Frequency (Modulator)
attenuation, 15 db directivity
Short Pulse: 800 pps
Beacon Pulse: 400 pps
Reflector Dish Gain
Long Pulse: 200 pps
AS-287/APS-31, AS-287B/APS-31: 600
Trigger Modulator Input
with strip, 800 without strip.
Amplitude: 20 to 50v
AS-553/APS-31B: 2500
Duration: 1.5 usec at half amplitude
Receiver Sensitivity Maximum Noise: (RT-
Rate of Rise: 0.2 usec at 90% ampli-
101/APS-31, RT-101A/APS-31), 5.5 db;
tude
(RT-247/APS-31), 5 db
IFF Amplitude: 25 to 54v
IF. Amplifier Gain: (RT-101/APS-31,
IFF Duration: 0.25 to 0.5 usec
RT-101A/APS-31), 105 db min; (RT-247/
IFF Rate of Rise: 0.04 to 0.1 usec at
APS-31B), approx 130 db
90% amplitude
Power Requirements: 115v 380 to 1600
INSTALLATION CONSIDERATIONS
cps, 9 amp, 95% pf (leading), 90% pf
Not available.
(lagging); 27.5v dc, 40 amp
AN/APS-31: 2
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