RADIO PROPAGATION OVER THE SEA IN THE 2-TO-10-MHZ RANGE.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 21, 1967
- Accession Number
- AD0669442
Entities
People
- C. H. Freres
- D. B. Sailors
- T. L. Taylor