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| To: | [email protected] |
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| Subject: | Re: LF: Re: WSPR S/N Tests |
| From: | Andy Talbot <[email protected]> |
| Date: | Sun, 7 Feb 2010 21:09:54 +0000 |
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Yes.
Odd that.
Increased spectrogram noise reading when it ought to be filtered out
I suspect the spectrogram is not a simple power level indication. SpecJT appears to be more of a CFAR indication and the WSPR one may be not-dissimilar in concept.
Doing this also produces a lot of false decodes - the spectrogram display in WSPR shows a couple of broad, bright, noise-like bands where the passband-stopband transitions of the audio filter occur, with assorted spectral lines that are probably low-level noise from one PC or another. I have often noticed the number of false decodes goes up when there are narrow- |
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