Accession Number : AD0771932

Title :   Nearly Vertical Incidence Skywave (NVIS) HF Frequency Assignment Factors.

Descriptive Note : Research and development technical rept.,

Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH N J

Personal Author(s) : Perlman,Sol

Report Date : DEC 1973

Pagination or Media Count : 35

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)

Descriptors :   *High frequency, *Radio waves, Management, Allocations, Communication and radio systems, Ionospheric propagation

Subject Categories : Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE