Some observations of long-delay wireless echoes on the 28-MHZ amateur band

Details Some observations of long-delay wireless echoes on the 28-MHZ amateur band Some observations of long-delay wireless echoes on the 28-MHZ amateur band

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2329g&link_type=abstract

Journal of Geophysical Research, Volume 85, Issue A5, p. 2329-2334

Physics

3

Scientific paper

Eight possible examples of long-delay echoes have been obtained on the 28-MHz amateur band by operating when the band is just ceasing to support ground-to-ground communication. The delay times of these echoes tend to be integral multiples of 138 milliseconds. Since it takes about 138 milliseconds for a radio wave to travel around the world, these signals may have been trapped in interlayer ionospheric ducts.

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