Peak meter is much clearer to set...would be similar to the RMS if one didn't
have the slider attached to it. But I've always set my data collections on
other systems for peak values to not clip.
We've got 90dB of space to work with. Why would we NOT want the dynamic range?
I'm finding more decodes with the higher level...more dynamic range means more
accurate FFTs and such, doesn't it?30dB RMS is 40+dB of peak value so I rounded
up to 50dB and that still leaves 40dB headroom for peak value.
I've been running 20M with all sorts of signals splattering and never saw
anything over 80dB peak level running a 70dB peak level. Clipping have never
occurred with these settings (I'm doing some runs at different levels). The
RMS meter had a kind of peak hold but it was RMS peak hold.The new meter also
shows when clipping occurs...which is something one really needs to know.
I left the RMS number on there as having a reference for the noise may be
handy....if nobody wants it anymore it can go away but a noise reference is at
least of interest.
de Mike W9MDB
From: Joe Taylor <j...@princeton.edu>
To: WSJT software development <wsjt-devel@lists.sourceforge.net>
Sent: Thursday, March 2, 2017 2:16 PM
Subject: Re: [wsjt-devel] Cumulative patch
Mike --
More questions about your suggested changes to the noise-level metering
function and the associated widget.
Why should we prefer a peak-reading to average-power-reading meter?
The preferred level of 30 dB is for average, not peak. That's the
average noise level with no significant signals present. Especially if
there are broadband noise spikes present, I don't want the meter
responding to them any more than necessary. And we already had a
(sort-of) peak-hold indicator, right?
When real signals come on, on a crowded band, the level may go much
higher than 30 dB.
It's fine to change some color to red when some raw (absolute-value)
samples get larger than (say) 20000, or the rms is less than (say) 10.
And I think it's right to make the gain slider NOT affect the reading of
the level meter.
Why do you want the dB numbers displayed on both the status bar and just
below the thermometer?
-- Joe
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
_______________________________________________
wsjt-devel mailing list
wsjt-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/wsjt-devel
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
_______________________________________________
wsjt-devel mailing list
wsjt-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/wsjt-devel
