Accession Number : AD0669442

Title :   RADIO PROPAGATION OVER THE SEA IN THE 2-TO-10-MHZ RANGE.

Descriptive Note : Research rept. Jul 66-Jan 67,

Corporate Author : NAVAL ELECTRONICS LAB CENTER FOR COMMAND CONTROL AND COMMUNICATIONS SAN DIEGO CALIF

Personal Author(s) : Freres,C. H. ; Sailors,D. B. ; Taylor,T. L.

Report Date : 21 NOV 1967

Pagination or Media Count : 63

Abstract : Computer model studies reveal effects of sky wave and noise on the ground wave. Sky-wave interference is greater for low sunspot number, for low F-layer height, and in winter. For 1-kW radiated power at night, the sky-wave field strength of the one-hop F2 mode at 3 MHz is equal to the ground-wave field strength at a range of 340 km. When vertically polarized antennas with a sq cos delta pattern are used, the ground-wave signal strength is 20 dB above the sky-wave signal strength at a range of 340 km. The detectability of signals within the 2-to-10-MHz band at long range by sky-wave modes is also given. (Author)

Descriptors :   (*RADIO TRANSMISSION, *IONOSPHERIC PROPAGATION), OCEANS, MATHEMATICAL MODELS, RADIO WAVES, PROPAGATION, ATMOSPHERICS, IONOSPHERIC PROPAGATION, COMPUTERS, MICROWAVES, POLARIZATION, RADIOFREQUENCY INTERFERENCE, PERIODIC VARIATIONS

Subject Categories : Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE