QUOTE: ........ but what happens when the sweep range is different for
nanovna-saver than the H4's stored cal? Are results invalid, or are they
interpolated (assuming nanovna-saver is sweeping in a sub-range of the H4's
calibrated range)?
When you do a cal in SAVER, there is an option to clear all previous cals.
This SHOULD BE EXERCISED to assure a clean and meaningful new cal.
When you change the sweep width, it is always an excellent idea to do a new
cal dedicated to the new intended frequency sweep range. If the "new"
range is greater than the previous cal range, the instrument will use the
cal but interpolate between cal points. This potentially will introduce
extrapolation errors which could have been avoided by doing a dedicated new
cal over the "new" intended frequency sweep range. When changing sweep
ranges it's ALWAYS a good practice to run an additional cal dedicated to
the new range. This also applies to "professional" (and very expensive)
VNAs.
Dave - W?LEV
On Sat, Apr 26, 2025 at 3:59?PM Dean W8ZF via groups.io <dwfred=
[email protected]> wrote:
Thanks for the replies. There seems to be some disagreement on #2.
Appparently for some versions (maybe all), the cal in nanavna-saver IS
dependent on the H4 being in a calibrated state before the nanovna-saver
cal is performed. I can do the H4 internal cal, no problem, but what
happens when the sweep range is different for nanovna-saver than the H4's
stored cal? Are results invalid, or are they interpolated (assuming
nanovna-saver is sweeping in a sub-range of the H4's calibrated range)?
--
*Dave - W?LEV*
--
Dave - W?LEV
