MEASUREMENTS OF AROUND-THE-WORLD HIGH-FREQUENCY PROPAGATION
Abstract
Studies of round-the-world (RTW) signals, with transmitter and receiver at the same location, were made using 50-kw, 1-msec pulse transmissions in the 12- to 28-mc range. Information includes av. monthly curves of RTW max frequency vs time of day, time delay and pulse dispersion as a function of radio frequency, variation of optimum propagation azimuth with time of day, and degree of degradation of RTW propagation by geomagnetic storms. Predicted curves of av. monthly RTW max propagating frequency vs time of day were obtained with National Bureau of Standards world maps, and compared with the measurements. These curves predict certain features of RTW propagation, but provide too low an estimate of the max frequency that can propagate at any given time, if ionospheric tilts are neglected. The dominant propagating mode is concluded to be a combination of earth-ionosphereearth hops on parts of the path, and F2-layer to - F2-layer hops, made posible by layer tilts, on the remainder of the path. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1962
- Accession Number
- AD0272625
Entities
People
- R.b. Fenwick
Organizations
- Stanford University