John,
Guess the biggest reason is that more of the frequency spectrum is
displayed in the panadapter rather than just a 3 Khz spectrum in the
usual digital waterfall.. Here is one thought, if you change the
Sample rate to 48K and then use the 4X you can diffinely see the
difference Maybe a Feature Request for a 8X or 16X in the magifier
might be in order.. Good thought.
73,
Dudley
WA5QPZ
John Ragle wrote:
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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