On Wed, 2 Oct 2019 at 20:51, alan victor <avictor73@...> wrote:
Good day,
When I began this process of working with the NanoVNA, I was not certain
how the cal standards were being treated. Since the completed cal showed a
perfect open, short and termination, I was pretty certain they were NOT
defined as REAL SMA connector devices! The SMA connectors are NOT that
perfect!
Alan
Ignoring random errors (noise, repeatedly of connectors etc), the standards
should look perfect opens and shorts, i*f that is how they are defined. *You
could use an SMA plug with a few cm of wire and leave it open to make your
open, and put your short on the end of a few cm of wire. If the calibration
standards are defined to be perfect text-book opens and shorts, they would
look like that on the Smith Chart. If you then put the supplied short on
the VNA, that would look wrong.
The female standards supplied with the kit are not bad at all. The problems
are going to occur when using most other connectors - everything except
APC7 is going to have some problems.
