Hi Alan,
one of the features of NanoVNA-Saver - the prime one, really, from my point
of view - is the ability to sweep many more than 101 points. I think I've
used it up to 20200 points at one time, but I believe there are people who
have tried more ;-)
So it should be possible to get decent data, I hope.
--
Rune / 5Q5R
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On Wed, 25 Sep 2019 at 22:02, alan victor <avictor73@...> wrote:
One other note Rune. And others can comment in if I am off base. After
thinking about this a bit more, there may be an issue in obtaining GD and
what is known as differential group delay accurately particularly for
NARROW band networks. The Nanovna is currently limited to 101 data points.
No issue for wide band networks but for narrow band there may be a problem
with just 101 points to obtain a sufficiently small aperture. As a rule of
thumb, to get GD proper, the frequency step size must be a fraction of the
network band width. Taking that into consideration, 101 data points may
fall short of the desired resolution to obtain GD. Maybe not, have to run a
simulation for grins on say a crystal filter or a very high Q LC filter and
see if this is an issue. FUN!
Alan
