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This report covers the work done under the first phase of a continuing program of field tests on ATCRBS transponders. Characteristic transponder parameters were measured to determine their degree of compliance with the current specifications. A mobile van was outfitted with electronic test equipment which simulated the transmitter and receiver sections of a ground interrogator and allowed measurement of transponder parameters. A horn antenna located near the aircraft under test was used to couple signals to and from the transponder. The tests were performed at nine civilian airports on transponders installed in operational general aviation aircraft. The results of the measurements on the first 96 units are reported in detail and tentative conclusions drawn.

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