Martello S 723

The Marconi Radar Type S 723, also known as RAF Type 91, was a long-range, transportable 3D surveillance radar system designed for global military air defense applications. Operating in the L-band (IEEE designation) or D-band (NATO designation) with a peak power of 132 kW and an average power of 5 kW, it had an instrumented range of 500 km. Its planar array antenna, composed of 40 linear arrays, rotated at 6 revolutions per minute (10 seconds per rotation) to provide all-round surveillance with a beamwidth of 1.6 degrees. Each linear array featured a solid-state power amplifier and an associated receiver, with return signals processed by a beamforming system to create six simultaneous surveillance and height-finding beams, offering cosecant-squared coverage up to 20 degrees. The system could achieve 1 to 4 hits per scan and utilized a plot forming unit and plot processor to extract target plan position, elevation angle, and height, correlating primary radar data with secondary surveillance radar (SSR) data to generate 3D plot messages for remote display and tracking systems.

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