Dudley...
As I said in my note, "What controls the /*maximum resolution*/ on
the abscissa of the waterfall view?" ... the issue is not that of color
[amplitude resolution], it is one of /*frequency*/ resolution.To give
you a concrete example, try using the wf view on pSDR to distinguish
between Olivia 8/500 and Olivia 16/500...it is not possible. It looks
like the FFTs in fldigi or DigiPan are done with at least 8192 points
and a resolution of about 1 Hz. I guess the wf display on pSDR is worse
than 1/5 or even 1/10 that, e.g. about 5 to 10 Hz, so that the frequency
resolution (abscissa) is much poorer. This is very important if one is
using the waterfall to distinguish between various types of
(particularly e.g. MFSK) signals.
I hope this clarifies what I meant by "muddy." I would like to be
able to use the wf on pSDR to help decide just what sort of digital
signal I am looking at.
John Ragle -- W1ZI
===============
Dudley Hurry wrote:
John,
Exactly what you mean muddy? You should be able to adjust the "Low
Level" gain in the Display tab to have a black or what ever color you
want for the background (-120 for example here) and then any signals
will show up as dark blue for weak to reds for strong signals..
Remember that this is RF signals not Audio tones as you are displaying
in one of the digital programs, so background random noise will show up.
73,
Dudley
WA5QPZ
John Ragle wrote:
What controls the maximum resolution on the abscissa of the
waterfall view? I understand about FFTs, sampling rates, etc. but
don't understand why the waterfall in pSDR is so muddy compared to,
say, FLDIGI or DigiPan, seeing that they are processing the same
audio stream with their FFTs. I have played at length with the
"Display" controls in Setup without being able to effect any
improvement in the pSDR display.
John Ragle -- W1ZI
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