Investigation of Transponder Reply Fade-Out in the Vicinity of Chicago O'Hare Airport.
Interim rept. Mar-May 70,
NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J
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Exploratory flight tests were performed approximately 11 nmi south of the Chicago OHare ASR-4 Radar Beacon Site to determine why transponder replies were being lost in this area. The report presents a summary of the type of tests that were conducted and the results of each test. Analysis of the flight test data showed that the major cause of the coverage problem centered around the towers of the Remote Transmitter Site No. 1 and propagation vertical lobing. It was concluded that confirmation flight tests should be performed by the FAA Chicago Area Office prior to any site modifications. Author
- Active and Passive Radar Detection and Equipment