Hi Herb,
my code thus far does indeed try to extrapolate what the -60 dB point would
be. Only I'm nowhere near good enough at making calculations like this, so
I'm stumbling a little. I know what the -6 dB point is, and I know
(roughly) how many dB per octave or decade the filter drops by. I think I
then need to do something magic involving logarithms, probably something
really simple - but I haven't sat down and figured it out yet.
Suggestions welcome if it's obvious to you, the reader. :-)
--
Rune / 5Q5R
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On Fri, 4 Oct 2019 at 17:53, hwalker <herbwalker2476@...> wrote:
[Edited Message Follows]
Mike,
Google on filter bandwidth and the majority of the results will come up as
the -3 dB point. Not saying the -6 dB and -60 db points are not useful
info, just that the -3dB point is the common reference.
One other point is that -60 dB is in the dirt for portions of the nanoVNA
measurement range. Rune would have to extrapolate the -60 dB point in that
range which lends itself to possible inaccurate assumptions of the filter's
behavior.
Herb
