Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/APS-33C
Output-Pulse Duration Modulator
RELATION TO SIMILAR EQUIPMENT
MD-60A/APS-31
This equipment is similar to and interchangeable with
Short Pulse: 0.5 usec
Radar Set AN/APS-33 except uses different control and
Beacon Pulse: 2.25 usec
receiver-transmitter, does not include inverter and relay box.
Long Pulse: 4.5 usec
Pulse Repetition Frequency Modulator
TECHNICAL DESCRIPTION
MD-60/APS-31 or MD-60A/APS-31
Short Pulse: 800 pps
Power Requirements at Room Temperature
Beacon Pulse: 400 pps
AC: 9 amp at 115v, 380 to 1600 cyc; pf
Long Pulse: 200 pps
95% leading to 90% lagging
Modulator Input Trigger
DC: 40 amp at 27.5v
Amplitude:
20 to 50v
Rectified Voltages
Duration:
1.5 usec at half amplitude
-300 plus or minus 5v, regulated; 12 - 20 ma
Rate of Rise:
90% amplitude on 0.2 usec
-105 plus or minus 5v, regulated; 15 ma
IFF Trigger
Plus 105 (plus 50, -15) v, unregulated; 65 - 135 ma
Amplitude:
25 to 54v
Plus 150 plus or minus 5v, regulated; 121- 206 ma
Duration:
0.25 to 5 usec
Plus 300 plus or minus 5v, regulated; 102- 204 ma
Rate of Rise:
90% amplitude in 0.04 to
Plus 440 (plus 275, -80) v, unregulated; 20 - 200 ma;
0.1 usec
or plus 740 (plus 305, -155) v, unregulated;
Lab Trigger
10 - 50 ma
Amplitude: 25 to 54v
Plus 4800 (plus or minus 250) v, unregulated; 20 - 100 ua
Duration: 0.25 to 0.5 usec
RF Operating Frequencies
Ranges
Transmitter: 9375 plus or minus 55 mc
Range (Naut Mi)
Pulse Duration
Receiver Search: 9375 plus or minus 55 mc
5-60 var
short, long, beacon
Receiver Beacon: 9310 plus or minus 3 mc
0-120 fixed
long, beacon
Search Local Oscillator: 60 mc below transmitter freq
0-200 search
long
Beacon Local Oscillator: 60 mc below
80-20 beacon
beacon
beacon-transmitter freq
AFC Circuit
5-TD
short, long, beacon
Sweep Center (-60v mode): Var from -135 to -175v
30-TD
short, long, beacon
Sweep Frequency Range: 30 mc about center freq
Range Markers
Follows Freq Shift: At a rate of 150 mc
Range
per sec for 0.5 usec pulse at a rate of
Range (Naut Mi) Marker Intervals (N-M)
25 mc per sec for 5.0 usec pulse
5-10
2
Center of 40v Sweep: Can be varied from
10-25
5
100 to 200v
25-60
10
IF. Amplifier Transmitter-Receiver
0-120 or
20
RT-247/APS-31B
80-200 beacon
Gain: Approx 130 db
0-200 search 50
Band Width: 5 plus or -1 mc at 3 db down
Beam Characteristics of Antenna Assy
Band Width Long Range Search: 1 mc
AS-289A/APS-33 or AS-289B/APS-33
Center Intermediate Frequency: 60 plus
Beam Width: 1.80 ea side in azimuth at
or minus 1.25 mc
half power point
Log Range: 70 db
Beam Depth (Vertical): Conforms to
Video Output Impedance: 95 ohms plus or minus 10%
cosecant-squared pattern for depression
Indicator Video Amplifier
angles from 50 to 300
Voltage Gain: 25 approx
General Characteristics of Antenna Assy
Frequency Response: Flat within 3 db
AS-289B/APS-33
from 20 cyc to 5 mc
Method of Propagation: Feed-horn type
Receiver Sensitivity Transmitter-Receiver
radiator and parabolic reflector.
RT-247/APS-31B
Waveguide: Hollow, rectangular TEo1 mode
Max Noise Figure: 5.5 db
of propagation
Min Noise Output: 0.5v rms at full gain
Azimuth Range: PPI scan 360, sector 60
Peak RF Power Output: 52 kw min
plus or minus 10
Output-Pulse Duration Modulator MkD-60/APS-31
Fast Scanning Speed: 24 plus or minus 4 rpm, 360
Short Pulse: 0.5 usec
rotation; 90 to 100 looks per minute at 60 sector
Beacon Pulse: 2.5 usec
Slow Scanning Speed: 8 plus or minus 2
Long Pulse: 5.0 usec
AN/APS-33C: 2
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