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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