Rotor Radar System

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Rotor radar system


AN/FPS-3 (photo - Radomes, Inc.)This U.S. built AN/FPS-3 L-band centimetric radar had a range of around 200 miles. The size of the antenna may be judged from the height of the man standing on the right of the access platform. The AN/FPS-3 was a modified version of the AN/CPS-5 long-range search radar. The first units came off the Bendix production line and were ready for installation in the US in late 1950.

The AN/FPS-3B incorporated an AN/GPA-27, which increased the search altitude  to 65,000 feet. In the US installation of these modifications began in 1957. (Searching The Skies)


AN/FPS-3 (photo - Anstruther)My thanks go out to Don Helgeson, of Evanston, Illinois, USA who kindly provided the following information:

The Bendix AN/FPS-3 was a dual beam radar that used a pair of 5J26 Magnetrons with 750kW peak power. Unlike the DC variable drive of the AN/CPS-5 or AN/FPS-8, the AN/FPS-3 antenna rotated at fixed speeds of: 3.3, 5 or 10 RPM. 5 RPM seemed to be the best speed with the MTI prf of 400 pps. The two transmitter cubicles, the dual modulator and the common HV supply were mounted on the antenna framework. Slip rings fed power and control up and 30 MHz IF from the AM-4232 pre-amplifier down to the main console near the operations room. The AN/'MPS-7 was a mobile version of the AN/FPS-3.

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Updated 22/11/00

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.