Re: LF: EbNaut and The Cat / Take 3

[Andy Talbot <andy.g4jnt@gmail.com>]

Its a pity we no longer have 73kHz

Back in the early 1990's when that band was being proposed, one of the ideas put forward as an argument for getting it  was a link budget worked out showing how TA might be just about possible using coherent PSK with low symbol rates - something that would have been very difficult for amateurs in those early days of DSP.

The TA path was managed eventually once, or perhaps twice AFAIR,  by very slow QRSS at high power and, I think, a period of enhanced propagation.   Suspect it would be easy enough on EbNaut now.

The PIC 1kHz bandpass digitiser is a very neat way of doing the back end of an LF narrowband SDR, allowing embedded GSP timestamp and completely independent of all the nasties associated with soundcards

Andy  G4JNT

On 25 November 2015 at 20:42, Paul Nicholson <vlf0403@abelian.org> wrote:

Markus wrote:

>

take long to exhaust the permutations.

And what are the limits at LF?   How far do amateur signals go?

For that matter, how far does this mailing list reach?
How to interest more experimenters... away from Europe and
North America.

Was reading about lowFER, severe limits on antennas and input
power.  Now that could be interesting.   Do lowFER signals
reach Europe?

Lacking DX stations, the only option is some serious QRP.

Can we think of something interesting enough to drag Andy
away from his GUI?

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Paul Nicholson
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