|[AMRadio] Odd signals in lower 80 meters|
A.R.S. - W5AMI
ars.w5ami at gmail.com
Sat Dec 23 07:50:41 EST 2006
On 12/23/06, Jay Rusgrove <JRusgrove at comcast.net> wrote:
> Possibly the old NBVM (narrow band voice modulation) system debeloped by Dr. R.J. Harris and
> published in QST Nov. & Dec. 1978. There was a limited production run of commercial units, and a
> hard sell to the ARRL and commercial SSB users followed, however the concept never caught on.
> Imagine there are still units floating around.
> A brief overview of the system can be found here:
> Details are in the QST articles. Being in on the original testing, I can say it was darn near
> impossible to get any intelligence from the 'folded over' signal.
Jay, that is really interesting! I'm going to forward the link to the
guys at Flex Radio, as a Software Defined Radio could easily implement
such a method. This could be what we have been hearing.
Thanks for sending that info.
Brian / w5ami
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