Re: [rsgb_lf_group] Re: LF: DL-SWL

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

Just rereading the IEE Paper on amateur LF operation, written back in 2002 to try to recall the history.

http://www.g4jnt.com/IEEPaper.pdf

Yep, CWish

strictly speaking SLOWCW (as it was called then) or QRSS (as it started to be called later)  with mega ERP

Andy

On 4 January 2016 at 20:06, David G0MRF g0mrf@aol.com [rsgb_lf_group] <rsgb_lf_group@yahoogroups.co.uk> wrote:

 

Hi Andy.

Just like Marconi (?) the first TA contacts between 9/2000 and Jan 2001 on 137 were plain CW.

 

73

 

David

 

 

-----Original Message-----
From: Andy Talbot andy.g4jnt@gmail.com [rsgb_lf_group] <rsgb_lf_group@yahoogroups.co.uk>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>; rsgb_lf_group <rsgb_lf_group@yahoogroups.co.uk>
Sent: Mon, 4 Jan 2016 19:38
Subject: [rsgb_lf_group] Re: LF: DL-SWL

 

Indeed - 

What happened to WOLF  (*) ?

I've just tried Googling (**) it and find practically no hits.  The data mode seems to have been used successfully  in the years around 2001 and on, for a bit, but has faded.   The URL I had for it is now gives the magic 404.  Didn't the first transatlantic contact on 137kHz use this mode?

I guess that as it used 10 baud  BPSK,  was considered too complicated for the average LF Op. to generate.   No one seems to use upconversion from audio, and few seem to be able to make simple PSK encoders.   Even for EBnaut, relays  are suggested as the means to reverse the phase (yes, truely !!).    I suppose, to be fair, 10 baud unfiltered BPSK from a high power transmitter is a bit unkind to other band users.

Andy  G4JNT

(*) Weak signal Operation at LF

(**) Other search engines are available - so it has been said.

On 4 January 2016 at 19:14, John Andrews <w1tag@charter.net> wrote:

For those who may be newer to this part of our hobby, Hartmut Wolff is somewhat of a legend in receiving TA signals in the 137 kHz band. Night after night while others could only see Loran lines and the debris from DCF39, Hartmut produced screenshots of some pretty weak North American signals. He also gave reports on the sadly-orphaned WOLF mode. As recently as last month, his 137.780 kHz grabber showed my signal on nights that it was invisible on the UK and other DL grabbers.

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Posted by: David G0MRF <g0mrf@aol.com>

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