Re: WOLF: 135975 Hz, 10 b/s

[Andy - KU4XR <ku4xr@yahoo.com>]

My first chance to use WOLF for a possible TA reception, and on LF too....Receiving now !!!

 

Andy - KU4XR - EM75xr - Friendsville, TN. USA
Coordinates: N: 35º 43' 54" - W: 84º 3' 16"
http://lwca.org/grabbers/ku4xr/
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From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org
Sent: Thursday, January 26, 2012 5:39 PM
Subject: WOLF: 135975 Hz, 10 b/s

WOLF ... good idea!

 

My TX antenna has been pushed up again tonight, and I intend to howl for a couple of hours, starting 23:00 UT at 10 b/s speed. 

 

As CFH is still sitting smack in the middle of the band, I'll move close to the lower edge, squeezing into a narrow HGA-sidebands gap on 135975 Hz (that is unless you may have other suggestions).

 

Best 73,

Markus (DF6NM)

 

From: John Andrews

Sent: Wednesday, January 25, 2012 3:30 AM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: WOLF DATA MODE S/N FIG ?

Graham,

There is no single s/n figure or specified BW in which to measure it.
WOLF works by building copy up over a period of time, and assuming good
frequency/phase stability, a half hour or more is practical.

The data rate is fairly fast, 10 b/s, with a 960 bit message, so that a
complete frame of data is sent in 96 seconds. You get three quick
reports in the first 96 seconds, and then decodes every 96 seconds
after. Each message is 15 characters, with no rules about callsign format.

Tests done some years ago show it roughly equivalent to QRSS60 in terms
of signal level. It does give some clues as to whether a signal has been
locked-in, and has the possibility of partial copy, unlike some "all or
nothing" modes. Fifteen characters in a half-hour is of course much
faster than QRSS60 would permit. 2-way QSO's are fairly easy with some
advance agreement on what to do with the 15 characters.

The downsides are the need for a linear transmitter system (as this is
PSK), receiver/transmitter stability and frequency accuracy. It works at
600 meters, but is fairly useless at 160 meters and up.

The newest version is by DL4YHF, and may be found at:
http://www.qsl.net/d/dl4yhf//wolf/ .

Note that this version has 5 b/s and 20 b/s variations. Testing has
shown that the program tends to provide copy in the same amount of time,
so there's no overriding advantage to either.

John, W1TAG

On 1/24/2012 7:27 PM, Graham wrote:
> WOLF DATA MODE S/N FIG ?
> Long time since I used wolf , anyone have the
> expected decode min s/n level ?
> and now what s/n was ref to , as changes
> may of taken place over time
> Tnx -G.
>
>
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