Nearly Vertical Incidence Skywave (NVIS) HF Frequency Assignment Factors.
Abstract
AT CAN BE USED WITHOUT PENETRATING EXISTING IONOSPHERIC LAYERS ARE COMPARABLE TO THOSE UNDER WHICH IONOSPHERIC VERTICAL INCIDENCE HF frequency measurements are made. The complete yearly record of the ionospheric vertical incidence HF frequency measurements made by the military team of the U.S. Army Radio Propagation Agency at Fort Monmouth for 1965 provides a body of data for determining feasible frequency assignments for NVIS HF communication. By briefly discussing the nature of an ionogram, 'f-plot' converted data, and factors affecting HF propagation hour-after-hour and day-after-day, a background is provided for statistically analyzing the body of data for making MUF (Maximum Usable Frequency) and FOT (Optimum Traffic Frequency) frequency assignments. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1973
- Accession Number
- AD0771932
Entities
People
- Sol Perlman
Organizations
- United States Army Communications-Electronics Command