Re: Nobody on 10GHz? Work yourself on JT9 via WebSDR
Neil Smith G4DBN
We can dream...
Hi Ben, my CW signal was so weak, it was right at the edge of
perception. It might have worked using *extremely* long dots,
perhaps 3 seconds, or maybe even longer, and displaying the result
on a waterfall, but using the slow and wide tones of this mode
spreads out the transmission of "CW G4DBN IO93" over 50 seconds,
and adds in some redundancy and error detection. No magic, and not
much technology other than a thing to generate the tone sequence,
and another thing to detect the tones and turn the sequence back
into plain text. The beauty of it is that if some of the tones
are missing or messed up, there is still enough left to
reconstruct the original message. It does it better than human
ears because it effectively works in much narrower bandwidths than
you could manage with a CW filter. It's huge fun as well,
although not *quite* as rewarding as digging out a weak CW signal
from under the noise. Thing is though, it would still have
managed to drag out the signal if it had been quite a bit weaker,
whereas my ears just couldn't manage it.
I wish more microwavers had digital modes available, it makes contacts possible even under very unpromising conditions and adds a dimension.
Huge thanks to the teams who make the WebSDRs possible. I use the
Eindhoven, Farnham and Mow Cop systems quite a lot in the dark
reaches of the night when sensible microwavers are safely tucked
up in bed.
On 15/03/2020 10:47, militaryoperator via Groups.Io wrote: