At risk of being corrected...
FCC doesn't administrate the bands by specific mode any more, but rather
then by bandwidth of the transmitted signal. This was intended to encourage
new modes be developed by leaving the door a bit wider than previously.
Narrow FM is too wide for any of the bands below 28 mHz. NFM IS allowed
on ten meters, but not even all of that band -- just the frequencies above
Narrow FM as defined by FCC is wider than AM, which is why AM is allowed
on the lower bands while narrow FM is not.
There is a simplex at 29.600, and a series of repeater channels starting at
There are a few other overlooked slivers other than the simplex and the
channels, but I've forgotten what they are. There aren't many, and activity
them must be near-zero would be my guess. If I recall correctly, narrow FM
allowed on any frequency above 29.3 mHz. That will cause some conflict from
satellite downlinks, so, see the ARRL "Considerate Operator's Guide" for
on where narrow FM would be welcomed.
Personally, I like ten meter FM a lot. It sounds lovely to the ear, and
two propagation modes -- near-in, via direct (but not classic "groundwave"),
and DX via the ionosphere when it's open. Locally, the relatively longer
compared to two meters provides good mobile coverage in a hilly area, the
waves crawling down into the valleys better than two meters.
See this ARRL page for more.
] On Behalf Of jchajecki
Sent: Thursday, February 28, 2013 11:31
Subject: [RADIOSHACKDX394] Re: FM on the DX394?
> Very interesting question. I'm curious as to why you would like to add FM
I had noticed in the band plan that there were some frequencies allocated
for FM mode, particularly on the 10m band. I also wondered whether FM mode
was permitted - and used - on frequencies allocated to 'all modes' and
wondered whether it would be worthwhile exploring them. I'm guessing they
would have to be Narrow FM. If its not generally used and there is not much
happening there, then it probably isn't worth the effort.
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