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Amateur Radio LicenseTesting Opportunities

The Dayton Amateur Radio Association has provided their schedule of Laurel VEC test sessions for 2018. Click here for more details.


NVIS Research Paper Available

(From ARRL Bulletin)

March 31, 2017

A thorough and fully annotated discussion of Near Vertical Incidence Skywave (NVIS) is available in the research paper, “Radio
Communication via Near Vertical Incidence Skywave Propagation: An Overview,” by Ben A. Witvliet, PE5B/5R8DS, and Rosa Ma

First investigated in the 1920s, NVIS propagation was rediscovered during World War II as “an essential means to establish
communications in large war zones such as the D-Day invasion in Normandy,” the paper notes, adding that the US Army subsequently sponsored a lot of NVIS field research, especially between 1966 and 1973. More recently, NVIS has become a popular means to enable close-in communication on Amateur Radio HF bands between 3 and 10 MHZ. NVIS can be used for radio communication in a large area (200-kilometer radius) without any intermediate manmade infrastructure, and it has been found
to be especially suited for disaster relief communication, among other applications, according to the paper.

“A comprehensive overview of NVIS research is given, covering propagation, antennas, diversity, modulation, and coding,” the
Abstract explains. “Both the bigger picture and the important details are given, as well as the relation between them.” As the paper
describes it, in NVIS propagation, electromagnetic waves are sent nearly vertically toward the ionosphere, and, with appropriate
frequency selection, these waves are reflected back to Earth.

In case the link for the research paper gets broken..

PS.. Ohio’s NVIS antenna day is scheduled for April 22. In addition to 40 and 80 meters, we want to add 160 and 60 meters (a good 160 antenna should also operate on 60). With the band conditions in the trash, we need to work up alternative bands and plans to maintain communications across the state! These new bands should make for some interesting antenna construction projects, so get your teams busy!!

Want more information on how to make a NVIS Antenna? Here’s a link..



Here is a link to an interesting article from Emergency about the Joplin tornado after five years.  It addresses lessons learned about being prepared, their actual response and the recovery period . Click here to view.






Glenn Gombert, KD8TSR, provided an excellent PowerPoint presentation on FLDIGI. The presentation is very detailed and comprehensive. Its good information whether you are getting acquainted with FLDIGI, setting up a station or going a little further into FLDIGI's many components and capabilities. Click here to view the presentation.


EmComm Article



Here is a link to an outstanding article on amateur radio emergency communications from Emergency Click here to view.






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