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RADAR BOMB SCORING CENTRAL - continued - TM-11-487C-10456

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Volume 1
MIL-HDBK-162A
Section 1
15 December 1965
ITEM NAME: RADAR BOMB SCORING CENTRAL
TYPE: AN/MSQ-35
Primary power equipment required for operation of the
Gain: 29 db
central is not supplied.
Coupling: Duplexing (TR and ATR)
The purpose of the Central is to acquire and track a
Polarization: Horiz
designated aircraft, permanently record it's flight path, and
Scan: Reflector tilt and var focus
compute the trajectory of a simulated bomb it releases. In
Elevation Scan Method: Electro-mechanical
addition to providing a continuous plot of aircraft position in
Scan Rate
the horizontal and vertical planes, weapon trajectory is
Elevation: 40 sec (up and down) from
computed and plotted in the same coordinates. Score data of
35 to 391 mils
the mission is computed and the results pointed out on tape.
Azimuth: Var from 0 to 20 rpm
Level, pull-up and other maneuvering type releases may be
Drive: 3-speed, 400-cyc, 3-ph motor
scored with the central.
Accuracy
The central is divided into three major functional groups:
Range: plus or minus 150 yds
an acquisition radar group of initially locating the aircraft
Azimuth: 18 mils
engaged in the bombing mission; a tracking radar group for
Beam-width
tracking the aircraft during the bombing run and supplying
Elevation: Var from 2 to 22 deg
position data to the computers; and a computer group for
Azimuth: 1.4 deg
converting aircraft position data and ballistic data into
Transmitting Group
coordinate form suitable for plotting aircraft path and weapon
Frequency: S-band, 3100 to 3500 mc
trajectory.
In addition, the computer group predicts
Peak rf Power: 1 megw
accelerations that would normally cause tracking lags and
Average rf Power: 780w
supplies aided tracking rates to the radar. Complementary to
Type of Modulation: Pulse
the three major groups is the communications group for
Pulse Shape: Rectangular
ground-to-aircraft voice communication during the bombing
Pulse Repetition Frequency: 600 pps
mission.
Pulse Duration: 1.3 usec
Four computer modes of operation are used during a
Transmitter Type: Tuneable magnetron
bomb scoring mission.  These modes are designated as
(type 5795)
acquire, synchronizing (sync), track, and computer.  A fifth
Magnetron Current: 25 to 35 ma
mode (the test mode) provides a complete check of the
Receiving Group
computer.
Receiver Type: Superheterodyne
Overall Noise Figure: 6 db
RELATION TO SIMILAR EQUIPMENT
RF Amplifier: Tunnel diode
Local Oscillator: Stalo (stable local
The AN/MSQ-35 is not interchangeable with any like item
oscillator)
in Air Force use.  The M-33 radar was utilized as a basic
Intermediate Frequency: 60 mc
building block. The modified M-33 was identified Radar Bomb
IF. Bandwidth: 2.3 mc at 3 db down
Scoring Central AN/MSQ-35. Techniques established during
Presentation Group
AN/USQ-9  development  program  were  utilized  in  the
PPI Scan: 10 in. PPI; azimuth coverage
AN/MSQ-35 production program.
is continuous; range coverage is
25,000; 50,000; 100,000; 200,000;
TECHNICAL DESCRIPTION
400,000 yds (IFF)
MTI Scan: Azimuth, 360 deg; var range
from 0 to 160,000 yds
Acquisition Radar System
Operational Limits
SIF/IFF: Interrogator Set AN/TPX-27
Range
provides SIF and IFF return signals
Fan-Shaped Beam: 150,000 yds max
for presentation on PPI at ranges up
Pencil Beam: 200,000 yds max
to 400,000 yds
With SIF/IFF: 400,000 yds
Tracking Radar System
Elevation: 35 to 391 mils
Operational Limits
Range: 200,000 yds
Azimuth: Continuous through 6400 mils
Antenna
With Beacon: 200,000 yds
Elevation: -180 mils to plus 1500 mils
Type: Hyperbolic reflector; Pill box
Azimuth: Continuous through 6400 mils
feed
Antenna
Type: Metal-plate, phase-advance lens
Gain: 39 db
Coupling: Ferrite-circulator duplexing
Polarization: Vert
Scan: Conical
Tracking Rate: Mach 10
Resolution: Can distinguish between
targets separated by 65 yds in range
and 18 mils in azimuth
Drive: 2-ph, 400 cyc motor; 1-ph, 208v;
other phase-variable
AN/MSQ-35: 2
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