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Re: LF: EbNaut and The Cat / Take 3

To: <[email protected]>
Subject: Re: LF: EbNaut and The Cat / Take 3
From: "Graham" <[email protected]>
Date: Wed, 25 Nov 2015 22:08:06 -0000
Importance: Normal
In-reply-to: <[email protected]om>
References: <[email protected]om><[email protected]><[email protected]><[email protected]> <[email protected]om>
Reply-to: [email protected]
Sender: [email protected]
 
 Bob WG2XRS  
 
December 12, 2013   02:25 73 WG2XRS de DL-SWL Op65 -43 dB F:9% in nr Wolfsburg
 
QRA locator’s JO52HP and FN12LP   6246.44 km ,
 
Bob bowled a googly that night,  right in at the  system limit , ook  65 mins  data ,  -43 db ,
 
Local 'usa' decodes  +20 db up.
 
-23dB s/n OPERA 0.073 08/12/2013 23:07 WG2XRS W3NF
-20dBs/n OPERA 0.073 08/12/2013 23:07 WG2XRS K3SIW
-9dBs/n OPERA 0.073 08/12/2013 23:07 WG2XRS W1VD
-18dBs/n OPERA 0.073 08/12/2013 23:07 WG2XRS KB4OE
 
73-G,

Sent: Wednesday, November 25, 2015 9:32 PM
Subject: Re: LF: EbNaut and The Cat / Take 3

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 <[email protected]> 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?

--
Paul Nicholson
--


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