[aprssig] The 30m Band Utilization Chart -- 2 June 2011
Ian Wade G3NRW
g3nrw at yahoo.co.uk
Thu Jun 2 02:58:45 EDT 2011
Just in time for the 30m Multi Mode weekend -- 4/5 June 2011.
A few weeks ago Don Hobson, KB9UMT, founder of the 30m Digital Group,
published the updated "unofficial 30m bandplan" on the 30MDG reflector.
I responded, saying that the listing was a little misleading, because
some frequencies were dial frequencies, others were emitted frequencies,
and it wasn't clear which was which.
Don challenged me to do better. At first I tried to improve the listing
format, to draw the distinction between dial and emitted frequencies,
but quickly realized this was not an easy task! I finally capitulated
and decided on a graphical format instead:
I have called it a "Band Utilization" chart. It is exactly that. It is
not a "bandplan", nor even an "unofficial bandplan". Rather, it is an
attempt to graphically portray the many modes that are actually in use
on 30m today. On the chart there is a clear distinction between dial
frequencies and emitted frequencies, helping you to accurately set the
correct frequency and to identify signals as they appear on the
Prior to posting the chart on my website, I sent a couple of draft
versions to a number of the world's "movers and shakers" in digital
communication and HF. Several of them responded with very helpful
comments, suggestions and corrections, for which I am very grateful.
It's been an "interesting" exercise to fit everything in, but I hope you
will find the finished chart useful. I think you will be intrigued to
see just how much is squeezed into the band, especially above 10.140. In
particular, the graphical approach highlights several overlaps between
modes, which (to me at least) weren't at all obvious from the tabular
frequency listing. I was also unaware of just how many Winlink RMS
stations are active: no less than 48 stations on 32 frequencies, mostly
The chart is a living document. If you see any errors or omissions, or
want to suggest improvements, please email me at g3nrw at yahoo.co.uk
Enjoy the Multi Mode weekend!
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