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Wolf, John & other WOLFmen
Another 2 cents...
Did not notice any improvement
receiving XES running 2.5 vs 10. Since we're so close I have taken to
using a "calibrated" clip lead for the antenna to reduce his signal to puny weak
levels.
My initial run showed no improvement so I
immediately began looking for operator errors...but didn't
find any.
John...looking forward to some high speed
tests!
Jay, W1VD
----- Original Message -----
Sent: Monday, November 14, 2005 12:06
PM
Subject: Re: LF: Re: TA Nov,
13/14th
Greetings all,
John wrote:
>
> XES did
run in the WOLF 2.5 speed all night. I will use the 5 b/s rate
>
tonight with 50 watts, starting around 2330 UTC. Given WOLF's error
>
correction with copy being built up over a period of time, the slower
>
data rate may not be an advantage, as it is with uncorrected
PSK.
>
This was also my impression when thinking about the lowest
useful
signalling rate. 2.5 b/s may give the WOLF decoder too few bits
over a
single lift in propagation to recognize the sync pattern;
furthermore:
the lower the bitrate, the larger the requirements for
frequency
stability (which includes the 'calibration' of the soundcard
sampling
rate). I didn't check if the tolerance range isn't also divided
by four
when the signalling rate is divided by four.
John - please let
me know any results of your local tests. Maybe there
are one or two quirks
in my modifications of Stewart's original
algorithm, especially concerning
the scaling of the 'frequency
tolerance' parameter.
73,
Wolf DL4YHF .
P.S: Off-frequency posting ... I will be watching
3597.000 kHz tonight
in WOLF 5 mode, starting around 19:00 UT
.
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