Accession Number : AD0838394

Title :   COHERENT TECHNIQUES FOR AUTOMATIC DIRECTION FINDER.

Descriptive Note : Quarterly progress rept. no. 4, 15 Jul-14 Oct 67,

Corporate Author : ELECTRO TECHNICAL ANALYSIS CORP TUCSON AZ

Personal Author(s) : Battistelli, J. J. ; Perper, L. J. ; Hessemer, R. A.

Report Date : OCT 1967

Pagination or Media Count : 62

Abstract : A functional design was formulated for modification of the AN/ARN-89 ADF set for coherent operation. In this modification, improvements over the AN/ARN-83 modification include improved acquisition and phase-lock circuitry filtering techniques to reject received modulation at the ADF switching frequency, and carrier positive-identification techniques in transmission and reception. Measurements of the AN/ARN-89 PEDM receiver showed that specifications were not met by this apparatus. Since extensive changes will be made in the EDM model, detailed measurements were postponed. Theoretical studies were conducted of analog, linlock, and derived-rate rejection phase lock. A construction program was begun of phase lock circuitry for empirical investigation of the principles theoretically investigated, in the presence of noise and interfering signals. (Author)

Descriptors :   (*DIRECTION FINDING, AUTOMATIC), RADIO EQUIPMENT, AIRBORNE, PHASE LOCKED SYSTEMS, MODIFICATION KITS, DEMODULATION, THEORY.

Subject Categories : Direction Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE