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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. special event station gb80bob 1st september to 28th september 2020 the royal air force amateur radio society (rafars) will be operating a special even. Arrl, the national association for amateur radio 225 main street newington, ct, 06111-1400 usa tel fax toll-free hqarrl. Org contact arrl the arrl is a member-society and international secretariat of the international amateur radio union. Ham radio cycle 25 propagation conditions home qsl details propagation dx cluster contest calender essential resources qrz. Propagation prediction software for ham radio category is a curation of 30 web resources on , wsprnet , palmprop, beamfinder. Resources listed under propagation prediction category belongs to software main collection, and get reviewed and rated by amateur radio operators. the study of principles of propagation of electromagnetic waves and acquiring a reasonably good working knowledge of radio propagation go a long way in enhancing the quality of on-air experience for any amateur radio station operator. It is a complex subject where many variables of nature come into play. Special event station gb80bob 1st september to 28th september 2020 the royal air force amateur radio society (. Airspy sdr software download update windows sdr software package (change log)this package containssdr (sdrsharp) x86 revision 1756 299. In addition to creating a pretty light show (mostly in upper latitudes), ham radio signals scatter off of these particles and can greatly enhance propagation on the vhf and uhf ham radio bands. High levels of aurora can also make hf ham radio propagation via polar routes difficult. 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.