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Hi All,
I have been subscribed to this group for quite a few weeks now, but this is my first posting.
Why? Because it has taken me that long to read through all the previous posts!
Anyway, I have not seen this subject before:
Being an licensed amateur SWR, means much more to me than return loss, which because
of my background I asssociate more with TV equipmentt, so I was a little disappointed to find
that the lowest graphical reading is about 1.3:1. The numeric readout at the top shows the
figure, but the graphical result would be much more useful for making adjustments.
Is this a feature that "comes with the model sir", or is there an adjustment that I have missed?
As a new user I do have other questions, but that is quite enough for now.
Thank you
Tony (G3PTD)

Sounds like a calibration issue.
Mine will correctly show 1.1:1 numerically and graphically, I just checked.

73 de Andy

Hello Tony,
You can adjust the scale of the swr graph.
Display: scale: scale/div.
73 de Ton PA0ARR

Hi Tony,
Welcome to the group.? You read all 7000 posts?!? :-)

The NanoVNA is capable of displaying 1:1 SWR graphically so I'm not sure what you are referring to.
You can change the scale on the display to allow you to see finer resolution.
Have you downloaded a copy of the User Guide from the Files section of the forum?
/g/nanovna-users/files/NanoVNA%20User%20Guide-English-reformat-Oct-2-19.pdf
NOTE: I just realised there is no reference in the translated User Guide that describes how to adjust the scale on the display!!? I'll have to add that section.

In any case, select the Display menu and then select Scale.
From there you can set the reference position (defaults to 7, where 0 is at the bottom and 8 is at the top of the display).
Next, adjust the Scale per division.

For SWR, ensure your display Format is set to SWR for CH0 (obviously) and then select a Scale Reference of 0 (bottom division line on the display).?

Then, set your Scale to 0.1 .The bottom of the display will be 1:1 and each division above will increase by 0.1 (ie: 1:1.1, 1:1.2, 1:1.3).
You can also try a Scale of 0.05 for a finer resolution on the display.
I hope this helps (and thanks for the question - I'll have to update the guide now).
...Larry

Hello again,
Thank you for the replies, and thank you Larry particularly. That was just what I needed.
Well, I am not going to claim every single one of the 7000, because some are repetitive,
and I wasn't counting! But it certainly seemed like it.
And I had read that very very useful .pdf file of course. I am glad that I pointed out a need,
and sorry that your finished document now needs an addition. From my days teaching I
really do know that feeling!
Thanks again.
Tony...

Anybody know how to set negative value for reference position. For example, -20dB. seems the num. keypad does not have "-" symbol.

Hi Bing Wang
Reference position is the grid lines from lower Line = 0 to top line 0=8
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af bing-wang@...
Sendt: 18. december 2019 01:43
Til: [email protected]
Emne: Re: [nanovna-users] SWR readings off scale

Anybody know how to set negative value for reference position. For example, -20dB. seems the num. keypad does not have "-" symbol.

On Tue, Dec 17, 2019 at 04:42 PM, <bing-wang@...> wrote:

Anybody know how to set negative value for reference position. For example, -20dB. seems the num. keypad does not have "-" symbol.
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What measurement are you referring to? SWR cannot be a negative value unless there is something wrong in your set-up.

- Herb