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Amateur radio usable hf frequencies (page refreshed every 20 minutes) use the indicated color (red, yellow, green, blue, white, etc. ) to determine the recommended hf frequencies for contacts from your nearest base (new york, boston, atlanta, orlando, kansas city, phoenix, san francisco, and seattle). Any white bubble indicates no suitable frequency or high absorption. solar-terrestrial and hf and vhf propagation data provided and. Amateur radio special joint activation in celebration of the abraham accords peace agreement between the uae and the state of israel. The maximum usable frequency (muf) is the highest frequency that, with a probability of 50 of the time, can be used for radio communication between two points at a specified distance (but not necessary in all directions) via refraction by the ionosphere. Single hop propagation already starts at 70 in lower latitude areas. Worldwide long distance propagation (dx) may turn up already with a solar flux at 120. Propagation prediction software for ham radio category is a curation of 30 web resources on , palmprop, beamfinder, hf propagation app for windows. high frequency and vhf radio propagation data, solar and geomagnetic real-time and historic data, sunspot activity reports, as well as forecasts. A comprehensive propagation resource compiled by tomas hood, editor of the propagation columns of cq, cq vhf, popular communications, and monitoring times magazines. The american radio relay league (arrl) is the national association for amateur radio, connecting hams around the u. Vhf propagation map this map shows real-time radio propagation from stations operated near 144 mhz. It uses data gathered by automatic packet reporting system-internet service (aprs-is) from packet stations in the amateur radio service. One major reason for this is that the d layer, which absorbs hf signals, disappears rapidly on the sunset side of the grey line, and it has not yet built upon the sunrise side. tad cook, k7ra, seattle, reports sunspots returned on october 9 12, with sunspot numbers of 24, 26, 15 and 15.