Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/BPS-5A
plus or minus 30 pps
range indicator located in the Combat Information
Pulse Width: 0.5 usec
Center. This unit together with the PPI unit compose
Pulse Shape: Rectangular
the central control station of the equipment.
Frequency: 8740 to 8890 mc
The transmitter generates RF energy which is shaped
Peak RF Power: 75 to 100 kw
into a narrow beam by the radar antenna and radiated
Duty Cycle: 0.03%
toward the area being searched. Radar targets in the
Average Power: 22.5 to 30w
area reflect a minute amount of RF energy (echoes)
RF Lines RG-51/U: Waveguide
back to the antenna. These echoes are amplified and
VSWR: 1.1:1 max
detected by the receiver. The target echoes appear as
Radar Antenna
bright spots on the PPI screen; distances from the
Horizontal Beamwidth: 2.6
center of the screen represent target range and the
angular position of the target represents it's bearing.
Vertical Beamwidth: 16
The "area search" type of operation just described
Antenna Gain: 29.3 db
generally is performed with the submarine surfaced and
Polarization: Horizontal
using the raised radar antenna. Another tactical use of
Sidelobes: 23 db down (one way) at 6
the radar is "target track" operation in which the
ea side all others over 25 db down
submarine is submerged and the "ST" (periscope)
ST (Periscope) Antenna
antenna is used to avoid detection. Range of targets
Horizontal Beamwidth: 30
within 20 miles can be measured precisely and is
Vertical Beamwidth: 10
automatically applied to the ship's torpedo data
Antenna Gain: 14 db
computer. Target bearing is obtained by optically
Sidelobes Horizontal: 16 db down at
tracking the target with periscope.
60 ea side
The radar also has capabilities for cw communications
Sidelobes Vertical: 14 db down at
operation with another similarly equipped station.
20 ea side
During this type of operation, the radar functions just as
Receiving System
in search operation except that the radar antenna is
Antenna Coupling: Duplex converter, TR
pointed at the second station and the operator controls
and ATR tubes Detector
the radar transmissions with a telegraph key. A headset
Bearing Oscillator: Klystron, Type
is used to aurally monitor the transmissions. The
2K25
operator sends messages in international Morse Code or
First Detector: Crystal, Type 1N23B
other similar systems by operating the key.
Second Detector: Electron tube, Type
Other conventional features of the radar set are
6AL5
automatic frequency control of the 60 mc intermediate
IF. Frequency: 60 mc
frequency, sensitivity time control of receiver sensitivity,
Pre-IF. Bandwidth: 3.5 to 4 mc at 3 db
and anti-jam to suppress extraneous signals.
down point
RELATION TO SIMILAR EQUIPMENT
IF. Bandwidth: 9 mc at 3 db down point
None.
Video Bandpass: 3.5 mc at 3db down point
TECHNICAL DESCRIPTION
Gain Control: Manual , STC, FTC and AGC
Over-all Systems
Noise Figure: 17 db
Maximum Range: 160, 000 yds (80 mi)
Frequency Control: Manual and AFC
Minimum Range: 200 yds
Indicating System
Bearing Accuracy: plus or minus 0.250
Range Indicator
Range Accuracy
Display Size: 5 in.
0 to 60, 000 Yds: 25 yds plus or min-
Presentation: Type A
us 0.1% of measured range
Sweep Ranges: 0 to 4, 10 and 20 mi
60, 000 to 160, 000 Yds: plus or min-
Sweeps: Normal - A sweep with range
us 2% of measured range
step expanded 1000 yds after range
Power Requirements
step
General Power: 115v, 60 cyc, 1-ph
Range Readout: Counters in yds and mi
Standby: 1852 va
Min Increment of Yds Counter: 100 yds
Operate: 2367 va
Min Increment of Mi Counter: 0.1 mi
Trans-On: 3072 va
Electrical Range Output: Synchros at
Synchro Excitation: 115v, 60 cyc,
2000, 72, 000 and 1, 296, 000 yds revo-
1-ph, 600 va and 115 va
lution
Synchronizing and Transmitting Systems
Repetition Rate: 600 pps adjustable
AN/BPS-5A: 2
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