Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/APS-33D
Output-Pulse Duration Modulator
RELATION TO SIMILAR EQUIPMENT
MD-60A/APS-31
Short Pulse: 0.5 usec
This equipment is similar to and interchangeable with
Beacon Pulse: 2.25 usec
Radar Set AN/APS-34A except uses different control and
Long Pulse: 4.5 usec
receiver-transmitter. Does not include inverter and relay box.
Pulse Repetition Frequency Modulator
MD-60/APS-31 or MD-60A/ASP-31
TECHNICAL DESCRIPTION
Short Pulse: 800 pps
Beacon Pulse: 400 pps
Power Requirements at Room Temperature
Long Pulse: 200 pps
AC: 9 amp at 115v, 380 to 1600 cyc; pf
Modulator Input Trigger
95% leading to 90% lagging
Amplitude: 20 to 50v
DC: 40 amp at 27.5v
Duration: 1.5 usec at half amplitude
Rectified Voltages
Rate of Rise: 90% amplitude on 0.2 usec
-300 plus or minus 5v, regulated; 12 - 20 ma
IFF Trigger
-105 plus or minus 5v, regulated; 15 ma
Amplitude: 25 to 54v
Plus 105 (plus 50, -15) v, unregulated; 65 - 135 ma
Duration: 0.25 to 5 usec
Plus 150 plus or minus 5v, regulated; 121 - 206 ma
Rate of Rise: 90% amplitude in 0.04 to 0.1 usec
Plus 300 plus or minus 5v, regulated; 102 - 204 ma
Lab Trigger
Plus 335 (plus 105, -65) v, unregulated; 0 - 115 ma
Amplitude: 25 to 54v
Plus 440 (plus 275, -80) v, unregulated;
Duration: 0.25 to 0.5 usec
20 - 200 ma; or plus 740 (plus 305, -155) v,
Ranges
unregulated; 10 - 50 ma
Range (Naut Mi)
Pulse Duration
Plus 4800 (plus or minus 250) v, unregulated; 20 - 100 ua
5-60 var
short, long, beacon
RF Operating Frequencies
0-120 fixed
long, beacon
Transmitter:
9375 plus or minus 55 mc
0-200 search
long
Receiver Search:
9375 plus or minus 55 mc
80-20 beacon
beacon
Receiver Beacon:
9310 plus or minus 3 mc
5-TD
short, long, beacon
Search Local Oscillator: 60 mc below transmitter freq
30-TD
short, long, beacon
Beacon Local Oscillator: 60 mc below
Range Markers
beacon-transmitter freq
Range
AFC Circuit
Range (Naut Mi)
Marker Intervals (N-M)
Sweep Center (-60v Mode): Var from -135 to -175v
5-10
2
Sweep Frequency Range: 30 mc about
10-25
5
center freq
25-60
10
Follows Freq Shift: At a rate of 150 mc
0-120 or
20
per sec for 0.5 usec pulse at a rate of
80-200 beacon
25 mc per sec for 5.0 usec pulse
0-200 search
50
Center of 40v Sweep: Can be varied from 100 to 200v
Beam Characteristics of Antenna Assy
IF. Amplifier Transmitter-Receiver
AS-37B/APS-33A
RT-247/APS-31B
Beam Width: 1.2 ea side in azimuth of half power point
Gain: Approx 130 db
Beam Depth (Vertical): Conforms to cosecant-squared
Band Width: 5 plus or - 1 mc at 3 db down
pattern for depression angles from 3 to 30
Band Width Long Range Search: 1 mc
General Characteristics of Antenna Assy
Center Intermediate Frequency: 60 plus or
AS-378/APS-33A
minus 1.25 mc
Method of Propagation: Feed-horn type
Log Range: 70 db
radiator and parabolic reflector
Video Output Impedance: 95 ohms plus or minus 10%
Waveguide: Hollow, rectangular TEo1
Indicator Video Amplifier
mode of propagation
Voltage Gain: 25 approx
Azimuth Range: PPI scan 360, sector 60 plus or minus
Frequency Response: Flat within 3 db from
10
20 cyc to 5 mc
Fast Scanning Speed: 24 plus or minus 4 rpm, 360
Receiver Sensitivity Transmitter-
rotation; 90 to 10 looks per minute at 60 sector
Receiver RT-247/APS-31B
Slow Scanning Speed: 8 plus or minus 2
Max Noise Figure: 5.5 db
rpm, 360 rotation; 90 to 10 looks per
Min Noise Output: 0.5v rms at full gain
Peak RF Power Output:
52 kw min
AN/APS-33D: 2
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