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Date: Sun, 29 Jan 2012 07:01:10 -0500
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Subject: Re: LF: WOLF DATA MODE S/N FIG ?
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Andy

As interesting as WOLFs ability to dig out the weakest of signals, is it's unrivaled immunity to 
static. John, W1TAG and I have taken to testing 'digital' modes in both winter and summer ... as 
many that perform well during winter's low static levels fall flat on their face during summer. To 
date, nothing compares with WOLFs ability to produce results during periods of high static.

Jay W1VD  WD2XNS  WE2XGR/2



----- Original Message ----- 
From: "Andy Talbot" <andy.g4jnt@gmail.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, January 29, 2012 3:51 AM
Subject: Re: LF: WOLF DATA MODE S/N FIG ?


Definitely - and I maintain any coherent mode will win out over non
coherent ones where the path will support it.  And LF will support
coherency, especially at 10Hz rates.

Wolf has rather been forgotton, as the average LF punter just doesn't
seem to approve of high tech approaches, and seems, to my view anyway,
 scared of soundcard modes.    Opera has taken then by storm, I
suspect, mainly because its new; is the only data mode than really
does offer really narrow band working, hence several dB more sensitive
than WSPR.   Its been well engineered - very well buy the look of it -
but is still hampered by being non-coherent on-off keyed.
So by definition, must be several dB down on coherent modes, when
normalised for bandwidth.

What I don't know about Wolf,  are any details about how the decoding
is done.   Although Opera isn't documented, it is quite obvious how
the decoding must work to acheive the performance it does, and is no
doubt very similar to that in WSPR/JTxx which is well documented

But the overlying of repeated messages in Wolf is in a different area,
and perhaps its author could say a bit more.

In fact, I'd say Wolf has beenhiding its possibilities in the bushes,
capable of far greater development than non coherent modes and
probably even more effective on the LF bands than OP32.

Don't forget, the first Transatlantic reception of 73kHz used Wolf.
Back in the last century


Andy
www.g4jnt.com


2012/1/28 Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>:
> ...so Andy, would you suggest it may be useful even on VLF, where the phase
> is rather stable over a longer time?
>
> 73, Stefan
>
> Am 28.01.2012 20:18, schrieb Andy Talbot:
>
>>