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 .
|
