Accession Number : AD0614240

Title :   TRADEWIND DUCTING.

Descriptive Note : Final technical rept. for 18 Apr-18 Nov 64,

Corporate Author : SMYTH RESEARCH ASSOCIATES SAN DIEGO CALIF

Personal Author(s) : Bowen,E. D. ; Fay,W. J. ; Munoz,D. R.

Report Date : FEB 1965

Pagination or Media Count : 103

Abstract : An experimental research program is described in this report. The experiment was conducted to gain additional information on the Tradewind Duct mode for VHF communications over the 2500 mile path between Hawaii and Point Buchon on the central California coast. Medium power TV transmitters situated at Maui and Hilo were used as the source, and SRA - 506 phase-locked receivers and medium to high gain antennas were used at the receiving site. Multiple frequencies between 60 and 212 mc/s were used. Data concerning the signal strength versus time, height gain at the receiving terminal, and meteorological data along the path were obtained. This report describes the seasonal and diurnal duty cycle of the ducting mode of propagation and the fading rate and fading depth of the signal received. Correlation between the transmission loss and duty cycle and the meteorological data yields information on the feasibility of predicting this propagation mode. The cumulative distributions of the basic transmission losses are displayed. (Author)

Descriptors :   (*RADIO SIGNALS, PROPAGATION), (*TROPOSPHERE, RADIO TRANSMISSION), (*COMMUNICATION AND RADIO SYSTEMS, PROPAGATION), VERY HIGH FREQUENCY, TEMPERATURE INVERSION, MARINE METEOROLOGY, RADIO RANGES, HAWAII, CALIFORNIA, TELEVISION EQUIPMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE