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Tactical, Air Traffic Control and airfield radars

Type 82 "Orange Yeoman" radar

Aerial Assembly:

 

 

 Transmitter aerial 

 

45ft slotted linear array with circular polarization

Beamwidth

 

(1) Azimuth :0.5 deg (at 3dB points)

 

 

(2) Elevation 0 to 5 deg constant, 5 to 45 deg cosec2

Receiver aerials:

 

 

Stacked-beam

 

Lens and reflector feeding 11 horns and receiver channels

Beamwidth

 

(1) Azimuth : 1.7 deg

 

 

(2) Elevation : 30 deg approx (11 beams vertically stacked, each 2.5 deg and overlapping at half power points)

Fan-beam

 

Utilizes transmitter aerial as common aerial for both transmission and reception

Beamwidth

 

As for transmitter aerial

Secondary radar:

 

 

Interrogator aerial

 

Vertically polarized broadside array consisting of 32 radiating elements and a feeder system. Beamwidth in horizontal plane is 3 deg at half power points and 6 deg at -10dB

Control aerial

 

Quasi-omnidirectional in horizontal plane. In the vertical plane the beamwidth is 45 deg at half  power points.

Rotational speed 

 

8 rev/mm

Aerial drive

 

40 hp drive motor assembly comprising drive motor,  fluid coupling and auxiliary gearbox, and a main gearbox for transmitting the drive to the aerial platform

Transmitter

 

Pulsed magnetron, electro-magnet, water-cooled

Frequency

 

2750 to 2850 MHz

Pulse width

 

2uS

RF pulse power (peak)

 

2.5MW

PRF

 

500 pps + 50 pps

Receivers:

 

 

Stacked-beam

 

11-channel video receiver with facilities for mixing channels, gating and swept gain. Mixing circuits for 5 and 9-beam video for height finding purposes.

I.F.

 

13.5 MHz

I.F. bandwidth

 

1.2 MHz

Gain

 

Automatic gain equalization in 11 channels

Fan-beam

 

2-channel (A and B) video receiver with image rejection circuit and with one channel (B) incorporating pulse edge discrimination. In conjunction with use of circular polarized transmission provides improved signal-to-noise ratio and reduces the effects of rain clutter. Has facilities for mixing channels, gating and swept gain. Operates simultaneously with stacked-beam receiver and includes mixing facilities for combining stacked-beam and fan-beam video.

I.F.

 

13.5MHz

Bandwidth (over-all)

 

100 MHZ

 Bandwidth (Ch A)

 

450 kHz

Bandwidth (Ch B)

 

8 MHz

Gain

 

Swept gain (proportional to the square of the range over first 75 miles) and FAGC for reduction of clutter signals

Communications

 

(1) Internal arid external telephone system
(2) R/T facilities to aircraft
(3) Data links (Radar link Type 1 and RPERDS) to two remote radar stations

Power supplies

 

4l5V, three-phase, 50Hz (210 kVA) from national grid or diesel generators with no-break changeover facilities



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Constructed by Dick Barrett

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ęCopyright 2000 - 2003 Dick Barrett

The right of Dick Barrett to be identified as author of this work has been asserted by him in accordance with the Copyright, Designs and Patents Act 1988.