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The standard transmission media was a ridged assembly of two conductors isolated by Isolantite beads enclosed in three quarter inch copper tubing. Upon landing I reversed the 90 and 150 cycle signals in the receiver and transmitter.Īt the time of the first installation in a trailer flexible cable had not then been available. Never the less a quick demonstration convinced me that he was flying on noise. On another occasion he called me to tell me “the path is too low” I told him it was off the air and that the antenna was on the ground. By adjusting the carrier strength of the directive antenna the problem was solved. Patent Himmel 2419551) mounted half way up the antenna mast. His comment that the system, approaching touchdown, was “too sharp and needed to be softened” prompted me to devise a percent modulation control by adding carrier via a “softening” antenna (U.S. I flew with him almost daily as he perfected the pilot’s landing approach method.
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The CAA test pilot Pete Genero, assigned to the project, was a critical asset to the development of the system. The British system designed by ITT's Standard Telephone and Cable avoided the problem by using a frangible installation at the runway edge. While it met the specification it made the system more susceptible to reflection interference at the lower end.