The British Chain Home radar worked on a wavelength of 11 meters, about the rotor diameter of the C-30. This ensured a very strong echo.
Range determination was no problem, only requiring accurate time measurement.
Azimuth determination was quite difficult. A wavelength of 11 meters precluded the use of highly directional steerable antenna arrays; simply too big at this wavelength.
Azimuth was determined by comparing the phase of echo signals at two widely separated receiving antennas but the phase shifters that allowed superimposition of one signal on another weren’t very repeatable and had to be individually calibrated on a regular schedule.
That’s where the C-30 came in; strong echo and the ability to loiter over a known geographical point.
Last edited by C. Beaty; 05-08-2012 at 02:22 AM.
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05-07-2012, 04:42 PM
Linear Mode
