Re: LF: DL-SWL and WOLF

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

Yeeeess...

It is a bit dated isn't it.    Based on 11025 sampling rate, that'll give the old early WSJT soundcard calibration issues all over again.  And only appears to give soundcard output.  I do have an upconverter, but that needs I/Q drive and doubt the software generates that, so a phasing network needed.  Direct digital drive to to be able to control my Gaussian ramped PSK source would have been better.

Will take another look anyway - but I can see why its not used much here now...

Andy

On 4 January 2016 at 20:13, Laurence KL7 L <hellozerohellozero@hotmail.com> wrote:

WOLF(s) can still be heard from here in Alaska !- and got to be honest I run the Decca directly at full chat direct from my HB transverter -  but never had complaints about spreading though I didn't have a lot of locals even then in NE Oklahoma.
 
 It was and still is a fine mode and the Gui model is easish to run as long as you calibrate it correctly, even for me.
 
Im not sure there have been a lot of qso's but with John TAGs permission heres how ours went down a few years back (ok more than a few years now) as XDW my previous part 5 license over a 2100Kms plus path - Im still able to run it from here...the gear  is the same here as it was in 2003/5
 
http://www.w1tag.com/XDWQSO.htm
 
 
Laurence KL7L  WE2XPQ
 
 

 

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Date: Mon, 4 Jan 2016 19:38:45 +0000
From: andy.g4jnt@gmail.com
To: rsgb_lf_group@blacksheep.org; rsgb_lf_group@yahoogroups.co.uk
Subject: 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.