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Cossor CR 21

Description of the radar set, tactical-technical characteristics

Figure 1: Cossor CR 787 radar, formerly used on the top of the tower of the Airport “Beograd”
(© Aeronautical Museum-Belgrad)

Figure 1: Cossor CR 787 radar, formerly used on the top of the tower of the Airport “Beograd”
Aeronautical Museum-Belgrad)

Specifications
SR 21SR 787
frequency: 2 940 … 2 980 MHz (S-Band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 770 Hz
pulsewidth (τ): 1 µs
receive time:
dead time:
peak power: 500 kW
average power: 385 W
instrumented range: 70 NM
(≙ 130 km)
100 NM
(≙ 185 km)
range resolution:
accuracy:
beamwidth: 1.4°
hits per scan:
antenna rotation: 12 or 20 min-112 min-1
MTBCF:
MTTR:

Cossor CR 21

The Cossor CR 21 was an operating in S-Band standard ATC primary surveillance radar manufactured by Cossor Radar and Electronics Ltd. It could be used in a mobile or static role. Vertical coverage extends from 0-45 deg without tilting or switching off the beam. A 15 m² target is seen at a range of at least 70 NM at over 40,000 ft and larger aircraft at up to 100 NM. It used a fixed frequency magnetron. Features included moving target indication, for cancellation of permanent echoes and circular polarization by means of a quarterwave plate to detect an aircraft target in rain clutter of about 20 dB.

Cossor CR 787

Type CR 787 is similar, but incorporates a microwave low-noise pre-amplifier for 25 per cent greater range and reduced receiver noise. Its accuracy was sufficient for talking down even small jet aircraft. Both radars were in service in Australia, New Zealand, Africa and Europe between 1957 and the late 80s.

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