Repeaters: 146.700- Mhz | 146.970- Mhz | 443.700+ Mhz | 445.075- Mhz | PL: 100 hz

Near-Real-Time F2-Layer Critical Frequency Map

Ray (NM2O) has provided a link to the “Near-Real-Time F2-Layer Critical Frequency Map” website. The website shows the Critical Frequency. This information supplements the band conditions, flux, K, etc. graph to the left.

The definition of Critical Frequency is: The highest frequency that is returned when a signal is sent straight up. To work in close on HF, you need to be below the critical frequency.

The Space Weather site generates a new plot every 10 minutes or so. The plot takes into account the solar flux, the K index, the time of day and the date.


HAMVENTION 2015!

The largest amateur radio and electronics swap meet on the planet is this week.  Will you be there?

The Dayton Hamvention has been an annual swap meet since 1952.  There were 24,873 attendees during last year’s hamvention alone, that is a huge number of radio enthusiasts in one place!

For those of you interested in using vintage and used test equipment you can find anything at Hamvention.  It has often been said, ‘if you can’t find it at Hamvention you don’t need it.’


ARRL Seeks Member Input on Draft HF Band Plan Proposals

The ARRL is asking members to comment by April 19 on possible changes to the League’s HF Band Plans suggested by the HF Band Planning Committee. The survey is part of the committee’s efforts to tweak the band plans for the RTTY/data/CW portions of 80 through 10 meters — excepting 60 meters. The committee developed its suggested revisions to the voluntary band plans after reviewing some 400 member comments in response to a March 2014 solicitation that sought suggestions for using the spectrum more efficiently so that data modes may coexist compatibly.

“The committee concluded that most of the concerns voiced by members could be addressed by modest adjustments to the existing band plans, and mainly by confining data modes with bandwidths greater than 500 Hz to the FCC-designated segments for automatically controlled digital stations (ACDS) and to parts of the RTTY/data subbands above those segments,” ARRL CEO David Sumner, K1ZZ said. His article detailing the committee’s suggestions will appear in the April edition of QST.

The proposed changes differentiate among ACDS, narrow RTTY/data modes having a bandwidth no greater than 500 Hz, and wider data modes having a bandwidth up to 2700 Hz.

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