Accession Number : AD0716944

Title :   Investigation of Transponder Reply Fade-Out in the Vicinity of Chicago O'Hare Airport.

Descriptive Note : Interim rept. Mar-May 70,

Corporate Author : NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s) : Spingler,George F.

Report Date : DEC 1970

Pagination or Media Count : 55

Abstract : Exploratory flight tests were performed approximately 11 nmi south of the Chicago O'Hare 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)

Descriptors :   (*RADAR BEACONS, ATTENUATION), AIRPORT RADAR SYSTEMS, TRANSPONDERS, PROPAGATION

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE