Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/APS-B3A
Long Pulse: 4.5 usec
RELATION TO SIMILAR EQUIPMENT
Pulse Repetition Frequency Modulator
This equipment is similar to Radar Set AN/ APS-33 except
MD-60/APS-31 or MD-60A/APS-31
uses different antenna.
Short Pulse: 800 pps
Beacon Pulse: 400 pps
TECHNICAL DESCRIPTION
Long Pulse: 200 pps
Power Requirements at Room Temperature
Modulator Input Trigger
AC: 9 amp at 115v, 380 to 1600 cyc; pf
Amplitude: 20 to 50v
95% leading to 90% lagging
Duration: 1.5 usec at half amplitude
DC: 40 amp at 27.5v
Rate of Rise: 90% amplitude on 0.2 usec
Rectified Voltages
IFF Trigger
-300 plus or minus 5v, regulated; 12 - 20 ma
Amplitude: 25 to 54v
-105 plus or minus 5v, regulated; 15 ma
Duration: 0.25 to 5 usec
Plus 105 (plus 50, -15) v, unregulated; 65 - 135 ma
Rate of Rise: 9% amplitude in 0.04 to 0.1 usec
Plus 150 plus or minus 5v, regulated; 121- 206 ma
Lab Trigger
Plus 300 plus or minus 5v, regulated; 102- 204 ma
Amplitude: 25 to 54v
Plus 335 (plus 105, -65) v, unregulated; 0 - 115 ma
Duration: 0.25 to 0.5 usec
Plus 440 (plus 275, -80) v, unregulated;
Ranges
20 - 200 ma; or plus 740 (plus 305,
Range (Naut Mi)
Pulse Duration
-155) v, unregulated; 10 - 50 ma
50-60 Var
short, long, beacon
Plus 4800 (plus or minus 250) v, unregulated;
0-120 fixed
long, beacon
20 - 100 ua
0-200 search
long
RF Operating Frequencies
80-20 beacon
beacon
Transmitter: 9375 plus or minus 55 mc
5-TD
short, long, beacon
Receiver Search: 9375 plus or minus 55 mc
30-TD
short, long, beacon
Search Local Oscillator: 60 mc below
Range Markers
Range
transmitter freq
Range (Naut Mi) Marker Intervals (N-M)
Beacon Local Oscillator: 60 mc below
5-10
2
beacon-transmitter freq
10-25
5
AFC Circuit
25-60
10
Sweep Center (-60v Mode): Var from -135 to -175v
0-120 or
20
Sweep Frequency Range: 30 mc about center freq
80-200 beacon
Follow Freq Shift: At a rate of 150 mc
0-200 search
50
per sec for 0.5 usec pulse at a rate of
Beam Characteristics of Antenna Assy
25 mc per sec for 5.0 usec pulse
AS-378/APS-33A
Center of 40v Sweep: Can be varied from 100 to 200v
Beam Width: 1.20 ea side in azimuth at
IF. Amplifier RT-101/APS-31 or RT-101A/APS-31
half power point
Gain: 105 db min
Beam Depth (Vertical): Conforms to cosecant-
Band Width Normal: 5 plus or minus 1 mc
squared pattern for depression angles
at 3 db down
from 3 to 30
Band Width Long Range Search: 1 mc
General Characteristics of Antenna Assy
Center IF.: 60 plus or minus 1.25 mc
AS-378/APS-33A
Video Output Impedance: 95 ohms plus or minus 10%
Method of Propagation: Feed-horn type
Indicator Video Amplifier
radiator and parabolic reflector
Voltage Gain: 25 approx
Waveguide: Hollow, rectangular TEo1 mode
Frequency Response: Flat within 3 db from
of propagation
20 cyc to 5 mc
Azimuth Range: PPI scan 360, sector 60
Receiver Sensitivity RT-101/APS-31 or
plus or minus 10
RT-101A/APS-31
Fast Scanning Speed: 24 plus or minus 4
Max Noise Figure: 5.5 db
rpm, 360 rotation; 90 to 100 looks per
Min Noise Output: 5v rms at full gain
minute at 60 sector
Peak RF Power Output: 52 kw min
Slow Scanning Speed: 8 plus or minus 2
Output-Pulse Duration Modulator MD-60/APS-31
rpm, 360 rotation; 40 to 50 looks per
Short Pulse: 0.5 usec
minute at 60 sector
Beacon Pulse: 2.5 usec
Manual Beam Tilt Range: plus 10 to -20
Long Pulse.: 5.0 usec
Beam Tilt (Line of Sight) Stabilization
Output-Pulse Duration Modulator MD-60A/APS-31
Range: Plus 30 to -30 w/manual tilt
Short Pulse: 0.5 usec
setting of 0
Beacon Pulse: 2.25 usec
AN/APS-33A: 2
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