RADIO PROPAGATION OVER THE SEA IN THE 2-TO-10-MHZ RANGE.
Research rept. Jul 66-Jan 67,
NAVAL ELECTRONICS LAB CENTER FOR COMMAND CONTROL AND COMMUNICATIONS SAN DIEGO CALIF
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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
- Radiofrequency Wave Propagation
- Radio Communications