Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/APS-33F
Output-Pulse Duration Modulator
RELATION TO SIMILAR EQUIPMENT
MD-60A/APS-31
This equipment is similar to AN/APS-33A except uses
Short Pulse: 0.5 usec
different antenna, 1 in. log receiver and 7 inch indicators.
Beacon Pulse: 2.25 usec
Long Pulse: 4.5 usec
TECHNICAL DESCRIPTION
Pulse Repetition Frequency Modulator
MD-60/APS-31 or MD-60A/APS-31
Power Requirements at Room Temperature
Short Pulse: 800 pps
AC: 9 amp at 115v, 380 to 1600 cyc; pf leading to
Beacon Pulse: 400 pps
90% lagging
Long Pulse: 200 pps
DC: 40 amp at 27.5v
Modulator Input Trigger
Rectified Voltages
Amplitude: 20 to 50v
-300 plus or minus 5v, regulated; 12 - 20 ma
Duration: 1.5 usec at half amplitude
-105 plus or minus 5v, regulated; 15 ma
Rate of Rise: 90% amplitude on 0.2 usec
Plus 105 (plus 50, -15) v, unregulated; 65 - 135 ma
IFF Trigger
Plus 150 plus or minus 5v, regulated; 121 - 206 ma
Amplitude: 25 to 54v
Plus 300 plus or minus 5v, regulated; 102 - 204 ma
Duration: 0.25 to 5 usec
Plus 335 (plus 105, -65) v unregulated; 0 - 115 ma
Rate of Rise: 90% amplitude in 0.04 to 0.1 usec
Plus 440 (plus 275, -80) v, unregulated; 20 - 200 ma
Lab Trigger
or plus 740 (plus 305, -155) v, unregulated;
Amplitude: 25 to 54v
10 - 50 ma
Duration: 0.25 to 0.5 usec
Plus 4800 (plus or minus 250) v, unregulated; 20 - 100 ua
Ranges
RF Operating Frequencies
Range (Naut Mi)
Transmitter: 9375 plus or minus 55 mc
5-60 Var
short, long, beacon
Receiver Search: 9375 plus or minus 55 mc
0-120 fixed
long, beacon
Receiver Beacon: 9310 plus or minus 3 mc
0-200 search
long
Search Local Oscillator: 60 mc below transmitter freq
80-20 beacon
beacon
Beacon Local Oscillator: 60 mc below
5-TD
short, long, beacon
beacon-transmitter freq
30-TD
short, long, beacon
AFC Circuit
Range Markers
Range
Sweep Center (-60v Mode): Var from -135 to -175v
Range (Naut Mi) Marker Intervals (N-M)
Sweep Frequency Range: 30 mc about center freq
5-10
2
Follows Freq Shift: At a rate of 150 mc
10-25
5
per sec for 0.5 usec pulse at a rate of
25-60
10
25 mc per sec for 5.0 usec pulse
0-120 or
20
Center of 40v Sweep: Can be varied from 100 to 200v
80-200 beacon
IF. Amplifier Transmitter-Receiver
0-200 search
50
RT-247/APS-31B
Beam Characteristics of Antenna Assy
Gain: Approx 130 db
AS-617/APS-33F
Band Width: 5 plus or minus 1 mc at 3 db down
Beam Width: 1.2 ea side in azimuth at
Band Width Long Range Search: 1 mc
half power point
Center Intermediate Frequency: 60 plus or minus 1.25 mc
General Characteristics of Antenna Assy
Log Range: 70 db
Method of Propagation: Feed-horn type radiator and
Video Output Impedance: 95 ohms plus or minus 10%
parabolic reflector
Indicator Video Amplifier
Waveguide: Hollow, rectangular TEo1 mode of
Voltage Gain: 25 approx
propagation
Frequency Response: Flat within 3 db
Azimuth Range: PPI scan 36 , sector 60 plus or minus
from 20 cyc to 5 mc
10
Receiver Sensitivity RT-101/APS-31 or
Fast Scanning Speed: 24 plus or minus 4 rpm, 360
RT-101A/APS-31
rotation; 90 to 100 looks per minute at 60 sector
Max Noise Figure: 5.5 db
Slow Scanning Speed: 8 plus or minus 2 rpm, 360
Min Noise Output: 5v rms at full gain
rotation; 40 to 50 looks per minute at 60 sector
Receiver Sensitivity Transmitter-Receiver
Manual Beam Tilt Range: plus 10 to -20
RT-247/APS-31B
Beam Tilt (Line of Sight) Stabilization
Max Noise Figure: 5.5 db
Range: plus 30 to -30w/manual tilt
Min Noise Output:
0.5v rms at full gain
Peak RF Power Output: 52 kw min
AN/APS-33F: 2
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