Accession Number : AD0633428

Title :   TRANSEQUATORIAL 'F' LAYER STUDY.

Descriptive Note : Interim rept. for Dec 65-Feb 66,

Corporate Author : SMYTH RESEARCH ASSOCIATES SAN DIEGO CALIF

Personal Author(s) : Heritage,J. L. ; Bowen,E. D.

Report Date : APR 1966

Pagination or Media Count : 43

Abstract : Three months' data have been collected in a study of transequatorial F-layer radio propagation in the Far East. Three 24-hour transmissions per week are made from Okinawa on frequencies from 34 to 90 MHz and received at Darwin, Australia and Lautoka, Fiji Islands. The Okinawa - Darwin path is 4,300 km long, symmetrically displaced about the magnetic equator; it lies in a magnetic meridian plane. The Okinawa - Fiji path is 7,300 km long and cuts across the magnetic equator at an angle of 36 degrees. The months of December 1965, and January and February 1966 were typical of the solstice period -- regular midday reception on both paths on 34 MHz but little activity on the higher frequencies. Occasional VHF openings occurred at Darwin but seldomly at Fiji. With the approach of the equinox, March provided a dramatic increase of VHF activity at Darwin with frequent nighttime transmission of frequencies up to 77 MHz. Fiji VHF reception has also become more active but on a reduced scale relative to Darwin -- only one case of 54 MHz reception to date. The CW recording is working well with reliable acquisition of signals every time an opening occurs. Fair success has been achieved with the special experiments aimed at propagation mode identification. Pulse resolution of multipaths and angle of arrival measurement are producing results but need further development. (Author)

Descriptors :   (*RADIO TRANSMISSION, *IONOSPHERIC PROPAGATION), LOW FREQUENCY, RADIO WAVES, PROPAGATION, MULTIPATH TRANSMISSION, ANGLE OF ARRIVAL, RADIO EQUIPMENT, RYUKYU ISLANDS, AUSTRALIA, PACIFIC OCEAN, ELECTRONIC WARFARE

Subject Categories : Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE