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NanoVNA-Q 0.4.4 released:


Added average mode which allows to reduce measurement noises.
Very useful for calibration.

Hi Jean,

this afternoon i thought i was doing a table, i hope you thought so.

OK thanks, I will have a go with that one, I was hopping there was others. Thanks anyway, I need to play with it and see what it does.

Sent from Mail ( ) for Windows 10

*From:* Larry Rothman ( nlroth@... )
*Sent:* 26 November 2019 15:51
*To:* [email protected]
*Subject:* Re: [nanovna-users] Software for Anroid

Go to the Play store and search for nanovna.

You'll find the only app available - but make sure your android device supports USB OTG and you have an OTG cable.

Hi all

I have just got my unit and it works well but I am looking for the best software (for Ham Radio) to use on my Android phone and tablet?

I have nanoVNAPartner and nanovna-saver-v0.2.0 and was looking for something like this for my tablet.

What would be your suggestions please?

Thanks - 73

Les - M0LPB

Go to the Play store and search for nanovna.
You'll find the only app available - but make sure your android device supports USB OTG and you have an OTG cable.

I built a fixture to make it easy to test through-hole and SMT parts



You can use the ZIF socket with resistance as calibration standards and it
works well up into the UHF.

Dan

On Mon, Nov 25, 2019 at 8:08 PM Bob Albert via Groups.Io <bob91343=
[email protected]> wrote:

I connected a piece of coax to the nano and, at the far end, connected
first a resistor, then a capacitor, then an inductor. I read the nano
screen in all three cases and the value indicated was within about one
percent of what my lab quality gear measured. It's an amazing device,
really. As I raise the frequency, the reading changes (always putting the
marker at the cable end). So it's good to see, for example, how an
ordinary resistor behaves at rf. I should try a resistor and reactance in
series and see how it separates them. I will try a resonant circuit as
well so I can read the resonant frequency and maybe Q. It might work to
check crystals as well. As you know, the frequency accuracy is better than
1 ppm.

The range over which it's accurate isn't too great but for most
measurements it's entirely adequate. The signal level is around -10 dBm,
about 1/10 milliwatt, not enough to damage parts.

I have already measured cable length but that's a lot of trouble; cable
attenuation is very easy to read. Next I will see how it measures
characteristic impedance of coax. As an antenna analyzer it's very good
but it has many more uses than that.

I might see if I can calibrate it as an rf voltmeter.

I have already gotten my money's worth out of it.

Hi All
I have update my calibration document for male and female calibration.
I have added a set of screen copies how to set the calibrations for
NanoVNA-saver to compensate for the problem Rune made clear recently, that a
open C0 of 0 fF was illegal.
So now it works perfectly with the settings described.
The updated document attached and also available from the link
and female calibration NanoVNA-H.pdf
<>


Kind regards

Kurt

What app would Sam run on the iPad though?
I can only think of a terminal to access the console commands.

Yes, hardware support is prerequisite

Are there VNA iPad apps? (Haven't looked)

Sadly, iOS web browsers do not support webUSB apps,
and there are seemingly no free VNA apps,
and I find only one commercial (FieldFox) app


However, Python is supported on iOS, and scikit-rf apps exist..










.. as does Jupyter Notebook, e.g.



Related:

What app would Sam run on the iPad though?I can only think of a terminal to access the console commands.
Are there VNA iPad apps? (Haven't looked)

Hi Luis,
there's currently no way to merge the two pieces of software, as
NanoVNA-Saver is Open Source, and NanoVNA Partner is not. :-)

Going by the screenshots, it looks like it's merely a modification of
hugen's NanoVNASharp. He has previously been quite firm that he had not
plans to open source his software.

--
Rune / 5Q5R

Forgot to clarify, with 8 mA it has a little worse dynamic range for S11, but a little better dynamic range for S21.

See screenshots taken from S2P files.

Please, merge the best of nanovna_partner with the best of nanovna-saver.

Make it the nanoVNA-SavingPartner!!!


73 de Luis, CT2FZI



<>

It might work to check crystals as well.

Check under test jigs in /g/nanovna-users/wiki/Application-Notes

with 8 mA mode NanoVNA has a little worse dynamic range for 0-300 MHz.

Here is my measurements for both cases taken on NanoVNA-Q firmware with enabled average mode.

The test case is the following:
1) enable average mode
2) calibrate
3) connect 50 ohm on both ports
4) take s2p file with enabled average mode

2mA.s2p - use 2 mA mode for 0-300 MHz (default NanoVNA mode)
8mA.s2p - use 8 mA mode for entire frequency bandwidth

If Ipad supports USB-on-the-go, you may be able to connect it using USB.

iOS supports OTG (using so-called camera adapter) for some device classes, but not serial.
My understanding is that iOS does support serial devices via BLE.

Power 1,2 and 3 using a calibration done at power 1

I see comparable differences in resistance plots on device
when not recalibrating between power changes
e.g. from ~ 27 to 30 Ohms @ 496MHz for power 3 to 1;
inductance changes from ~1000 to 650 pH

Device recalibrations mitigate that.

I redid the 25 ohm measurement on three power levels.
Power 1,2 and 3 using a calibration done at power 1
For sure there is difference where it should not. Look at the light blue line





The 25 ohm was connected without a cable and the reference plane was shifted to eliminate the electrical length so there should be a pure constant R
--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

Bob,
I think most NanoVNA units use a type C USB connector. Some may be Micro USB. Our local 99-cent-only store often carries both types.
--John Gord

I need a replacement cable to go from the nanoVNA to the USB port. Any links, specs, or other help?

Bob

If Ipad supports USB-on-the-go, you may be able to connect it using USB.