Accession Number : AD0762517

Title :   Tactical Multi-Tuned Preselector.

Descriptive Note : Final technical rept. 20 Sep 71-20 Dec 72,

Corporate Author : WATKINS-JOHNSON CO PALO ALTO CALIF

Personal Author(s) : Tokheim,Robert E.

Report Date : APR 1973

Pagination or Media Count : 152

Abstract : A study was made primarily of nonreciprocal YIG filter preselectors for the purpose of providing a suitable front-end for frequency-selective communications receivers. It was shown that fixed-tuned miniaturized nonreciprocal YIG preselectors can be arranged in a YIG filter bank (multi-channel) configuration with narrow bandwidths, low insertion loss, high directivity, nanosecond switching, and frequency-hopping rates in the MHz range. Accurate mathematical models were developed for analyzing the YIG preselector and these were utilized in a computer design program for the reciprocal and tri-loop filter configurations. Feasibility of achieving bandwidths within the 0.1 to 50 MHz range with low insertion loss was demonstrated. (Modified author abstract)

Descriptors :   (*CHANNEL SELECTORS, RADIO RECEIVERS), TUNING DEVICES, FERRATES, GARNET, ELECTRIC FILTERS, YTTRIUM COMPOUNDS

Subject Categories : Electrical and Electronic Equipment
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE