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Trevor,
thanks for this comment! It would be interesting to
know how much spacing is needed between a weak WSPR signal and a relatively
strong neighbouring carrier, located within the WSPR analysis range
but outside the four-tone spectrum of the desired signal.
Unfortunately I can't contribute as I hadn't run
recordings, and also both the desired WSPR signal and the Loran
carrier were anyway too weak here for a meaningful
result. Perhaps Hartmut or Victor happened to have .c2 or .wav saving
enabled last night?
Best 73,
Markus
Sent: Saturday, December 14, 2013 6:43 PM
Subject: Re: LF: All 73 Banders...
As you know WSPR-X is regarded as experimental
software and as such Joe Taylor K1JT has
often asked for users to contact
him with any difficulties they encounter.
So how about Marcus, Hartmut,
Victor and anyone else, producing a .wav file of successful and
non
successful wspr-15 decodes including all the DCF77 and other qrm. The files
could be sent
to Joe direct or made available for him to download and he can
analyse them to see if any
improvements can be made.
K1JT email
address can be found at the bottom of this page
http://physics.princeton.edu/pulsar/K1JT/wspr.html
Trevor
G0KTN
Sent: Saturday, December 14, 2013 4:03 PM
Subject: Re: LF: All 73 Banders...
...
But both statiopns have a relatively strong Loran line, and Hartmut's
directional antenna is pointing towards Sylt. However the nearby line frequency
74603.280 Hz should have been well outside the occupied spectrum of Bob's WSPR
signal (74603.51 to 604.24), so it's not ovbvious why it should have prevented
decodes. I'm speculating that the WSPR software finds the strong line, tries to
sync to it, and then somehow excludes nearby real signals from further decode
attempts. To prove the point and see how much spacing is needed, we could
experiment with letting WSPR decode local audio signals in the presence of
injected carriers. But systematic trials with WSPR tend to be time-consuming,
even if such tests were accelerated by scaling to WSPR-2.
...
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