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Cannot restore CAL data


Harry Bloomberg 2020/12/04 20:02

I have a new SAA-2N device. Love it!

I can save the results of a calibration, but there's no way to recall
calibration data, meaning that every time I cycle the power I must
recalibrate. Are there any plans to add this feature? I believe other
NanoVNAs can do this.

Thans,
Harry Bloomberg

Harry Bloomberg 2020/12/04 20:06

In fact, the manual at
https://nanorfe.com/nanovna-v2-user-manual.html#__RefHeading___Toc3237_3240808850
says I ought to be able to to this. Attached is a screenshot. I do not
have the CAL->RECALL menu on my device at all.

Thanks,
Harry Bloomberg


On Fri, Dec 4, 2020 at 8:02 PM Harry Bloomberg <hbloomb@gmail.com> wrote:

John Gord 2020/12/04 21:09

Harry,
Do you have a RECALL option at the top menu level?  (Top menu probably has choices like DISPLAY, MARKER, STIMULUS, CALIBRATE RECALL, etc.)
--John Gord

On Fri, Dec 4, 2020 at 08:26 PM, Harry Bloomberg wrote:

Harry Bloomberg 2020/12/05 12:08

John:
Thanks for the answer. Yes, I have a RECALL menu at the top level. But
I have no CALIBRATE RECALL menu option

But, upon further review, as they say in the NFL...I think there is an
undocmented way to save my calibration data. Here's my steps to save a
calibration:

1) Perform a calibration and save the results (CAL->SAVE).
2) Configure my device to perform a measurement, say to measure the SWR
of a 2M antenna.
3) From the top level do CONFIG->SAVE.

It appears the calibration data is saved along with other settings like
which tract to use, the frequency range, and the type of measurement to
take.

Why do I believe the calibration data is saved when you do a
CONFIG->SAVE ?

1) When I cycle the power on the NanoVNA, and do CONFIG->RECALL, I see
the indication on the left of the screen that the calibration I saved is
now in effect.
2) The SWR curve after cycling power and restoring a recalled
configuration is the same as before.

I will do more testing to verify this. If this is correct, I will
absolutely keep the SAA-2N. It is very well constructed with a
nicely-finished aluminum case and it has N connectors, which I think are
studier than SMA.

73,
Harry Bloomberg W3YJ



On Sat, Dec 5, 2020 at 12:09 AM John Gord via groups.io <johngord=
verizon.net@groups.io> wrote:

John Gord 2020/12/05 14:46

Harry,
This varies depending on firmware version but:
CONFIG/Save usually saves frequency independent stuff like touchscreen calibration and screen orientation (flipped or not)
CAL/Save (top level SAVE in some firmware)  Saves calibration, frequency settings, bandwidth/average settings, and trace setup.
--John Gord

On Sat, Dec 5, 2020 at 09:08 AM, Harry Bloomberg wrote:

Harry Bloomberg 2020/12/05 19:04

I think I've verified that with my device saving the calibration seems to
also save the stimulation type and frequency range. These are recalled at
the higher-level RECALL menu. Saved four different calibrations, and the
associated simulation type, frequency range, and calibration set were
loaded. I'm new to this so thanks for putting up with this.

73,
Harry W3YJ

On Sat, Dec 5, 2020 at 5:46 PM John Gord via groups.io <johngord=
verizon.net@groups.io> wrote:

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