|
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)
Sent: Wednesday, January 25, 2012 3:30 AM
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.
>
>
>
> No virus found in this
incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.454 / Virus
Database: 271.1.1/4162 - Release Date: 01/23/12
19:34:00
>
|
