Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/BPS-5
Synchro Excitation: 115v, 60 cyc,
This unit together with the PPI unit compose the central
1-ph, 600 va and 115 va
control station of the equipment.
The transmitter
Synchronizing and Transmitting Systems
generates RF energy which is shaped into a narrow
Repetition Rate: 600 pps adjustable
beam by the radar antenna and radiated toward the area
plus or minus 30 pps
being searched. Radar targets in the area reflect a
Pulse Width: 0.5 usec
minut amount of RF energy (echoes) back to the
Pulse Shape: Rectangular
antenna. These echoes are amplified and .detected by
Frequency: 8740 to 8890 mc
the receiver. The target echoes appear as bright spots
Magnetron Stability: plus or minus
on the PPI screen; distances from the center of the
45 mc
screen represent target range and the angular position
Peak RF Power: 75 to 10 kw
of the target represents it's bearing. The "area search"
Duty Cycle: 0.03%
type of operation just described generally is performed
Average Power: 22.5 to 30w
with the submarine surfaced and using the raised radar
RF Lines RG-51/U: Waveguide
antenna. Another tactical use of the radar is "target
VSWR: 1.1:1 max
track" operation in which the submarine is submerged
Radar Antenna
and the "ST" (periscope) antenna is used to avoid
Horizontal Beamwidth: 2.6
detection. Range of targets within 20 miles can be
measured precisely and is automatically applied to the
Vertical Beamwidth: 16
ship's torpedo data computer.
Target bearing is
Antenna Gain: 29.3 db
obtained by optically tracking the target with periscope.
Polarization: Horizontal
The radar also has capabilities for cw communications
Sidelobes: 23 db down (one way) at 6
operation with another similarly equipped station.
ea side all others over 25 db down
During this type of operation, the radar functions just as
ST (Periscope) Antenna
in search operation except that the radar antenna is
Horizontal Beamwidth: 30
pointed at the second station and the operator controls
Vertical Beamwidth: 10
the radar transmissions with a telegraph key. A headset
Antenna Gain: 14 db
is used to aurally monitor the transmissions. The
Sidelobes Horizontal
operator sends messages in international Morse Code
Vertical: 14 db down at 20 ea side
(or other similar system) by operating the key. Other
Horizontal: 16 db down at 60 ea
conventional features of the radar set are automatic
side
frequency control of the 60 megacycle intermediate
Receiving System
frequency, sensitivity time control of the receiver
Antenna Coupling: Duplex converter,
sensitivity, and anti-jam to suppress extraneous signals.
TR and ATR tube detector
RELATION TO SIMILAR EQUIPMENT
Bearing Oscillator: Klystron, type
Radar Set AN/BPS-5 is a modernized version of
2K25
Radar Sets SS-1, SV-1, AN/BPS-1, AN/BPS-4, and
First Detector: Crystal, type 1N23B
AN/BPS-9A. Radar Set AN/BPS-5 is similar to Radar
Second Detector: Electron tube, type
Set AN/BPS-11 except for differences in antenna drive
6AL5
configuration. These differences exist because of the
IF. Frequency: 60 mc
intended installation of each radar.
Pre-IF. Bandwidth: 3.5 to 4 mc at 3 db
TECHNICAL DESCRIPTION
down point
Overall Systems
IF. Bandwidth: 9 mc at 3 db down point
Maximum Range: 160, 000 yds (80 mi)
Video Bandpass: 3.5 mc at 3 db down
Minimum Range: 200 yds
point
Bearing Accuracy: plus or minus 0.25
Noise Figure: 17.db
Range Accuracy
Frequency Control: Manual and AFC
0 to 60, 000 Yds: 25 yds plus or
Gain Control: Manual, STC, FTC and AGC
minus 0.1% of measured range
Indicating System
60, 000 to 160, 000 Yds: plus or minus
Range Indicator
2% of measured range
Display Size: 5 in.
Power Requirements
Presentation: Type A
General Power: 115v, 60 cyc, 1-ph
Sweep Ranges: 0 to 4, 10, and 20 mi
Standby: 1852 va
Sweeps: Normal-A sweep with range
Operate: 2367 va
Trans-On: 3072 va
AN/BPS-5: 2
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