Have you looked at the Wikipedia article on the Smith chart?:
It has a lot of math, but it also gives a description of how a given impedance (resistance + capacitive or inductive reactance) gives different measured values with different lengths of transmission line (coax, etc.) between the measuring device and the device being measured. Some values change with line length, some (like VSWR or return loss) don't change (much). If you are generally familiar with AC circuits involving inductance and capacitance, the Smith Chart can help understand how impedance varies along a transmission line, and the VNA is a tool that actually does those measurements over a range of frequencies.
For understanding impedance in general, you could look at old versions of the ARRL Handbook which can be found online.
--John Gord
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On Fri, May 15, 2020 at 01:36 PM, <m1dgq1@...> wrote:
i Have asked this before but my post seems to have been lost.
From experience and being taught i now what to expect as a result for a return
loss measurement .
From experience and being taught i know what to expect as a result for a vswr
measurement.
These are common knowledge results but has anyone put together a list of
expected results that are good for any of the other measurements we can do .As
a noob to vna's i am finding i get results but what are good and what are bad.
some explanation of what you see on the screen and what you expect to see
would be good but every video i have watched does not go into that detail they
expect you to know that answer. well I've got to be taught it first to know
it. anyone willing to teach an old dog new tricks?
or at least point me to some where i can read with out loads of maths that i
do not understand. I need a bit of spoon feeding of what i see on the screen
in relation to the maths or vice verse.
