Accession Number : AD0768217

Title :   Electronically Tuned Linear VHF Preselector.

Descriptive Note : Final rept. Nov 71-Jul 73,

Corporate Author : AIL DEER PARK N Y

Personal Author(s) : Markard,E.

Report Date : OCT 1973

Pagination or Media Count : 97

Abstract : RS. It summarizes the evaluation of ferrites and solid-state devices (primarily PIN diodes) for this application, and describes the performance of a digitally tunable, two resonator prototype filter incorporating PIN diode tuners. The prototype clearly demonstrated the feasibility of digitally tuned preselectors and indicated the following potential capabilities: High-speed digital tuning across the entire 30 to 80 MHz frequency range without the need for band-switching; Insertion loss on the order of 2 dB; Inherent frequency stability; Low average bias power requirement approximately 63 mW; RF power operation to at least 10 watts with second harmonic 80 dB below the fundamental; and Small size and lightweight, 8 cubic inches and 7 ounces, respectively. (Author)

Descriptors :   (*TUNING DEVICES, TRANSMITTER RECEIVERS), VERY HIGH FREQUENCY, DIGITAL SYSTEMS, FERRITES, SEMICONDUCTOR DIODES, RESONATORS, RADIO EQUIPMENT

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE