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Output impedance of a transmitter is not simple thing. Transmitter outputs are not matched to the output transistor or fet collector impedance. That impedance is usually very high. Usually matching circuits are made so that efficiency is best, that is the output device does not get too hot. So if you really measure output impedance of a transmitter, you get strange results. Besides, you may burn your transmitter or measuring device.

Hi Rune,
I tested your new guided calibration routine as well and all works fine with Win10 pro. Very well done! Thank you very much!
I keep getting some warnings, and I have no idea if the performance of the NanoVNA will suffer from those!? This is not related to the current version, I had that "feature" with all versions. The messages were generated during calibration.

Kind regards
Norbert, DG1KPN

Great stuff Rune!

On the R+jX chart the frequency axis scaling works FB but I cannot make the scaling of the data axes work.

73
Nick
G3VNC

On Fri, 27 Sep 2019 at 12:04, Rune Broberg <mihtjel@...> wrote:

I just released 0.0.12:




I am interested in knowing what platforms you are getting this software
running on, *particularly* if you had had to jump through hoops or do
anything unexpected to get it to run: Do email me at mihtjel@... if
you can tell me what you had to do to make it work, so that I may update
the documentation, or make things easier to install in the future.

Thank you!
--
Rune / 5Q5R

I’m not using my NanoVNA yet, as I have not got around to box it up
properly. But I will give your software a try on Solaris later. I have both
SPARC and x86. I don’t expect anyone else has tried that.

My normal computer is a quad core Xeon machine with OpenSolaris on it. I
also have a SPARC with Solaris 10, but I expect it would require too much
messing around to install all the software needed - git, python etc.

Dave.

--

Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom

Thanks for the effort with the software, Rune. Works fine on my Windows 10.

I’ve had this AVG thing with all versions from v.0.0.3 through to v0.0.12 except for v0.0.11… Each time I’ve clicked the “I Trust This File” option, but still have to wait for AVG to approve it. Paul M0GJL

Very well!
The guided calibration routine is working fine!

73s Holger, DF6DBF

First, THANK YOU, for your awesome and impresive effort with this project! Downloading the latest to test now... :)
73, DE KG5WXW

On Fri, 27 Sep 2019 at 12:33, yza <yzaVNA@...> wrote:

17 : From A Common User's Point Of View

Hello,

Allow us, please, for the sake of completeness of
an appropriate preparation of a presentation for the
Estimation of the -sine qua non- Core of the Measurement
Uncertainty that Exists in *A N Y * VNA System, regardless
of what it really is, a VNA or a NanoVNA,

Maybe if you wrote a document on this, including adequate references, much
like a scientific paper, we could follow you. But you have made endless
posts, at least one of which has incomplete definitions of the equations,
it is almost impossible for anyone to follow you.

I am sure what you have is interesting, and some will be able to follow you
- perhaps not myself as my mathematics is not very good. But the way the
information is presented makes it impossible to follow.

One of things that is important is the phase difference between the offset
male and offset short standards. This will obviously be 180 degrees at low
frequency, but will depart from this as frequency is increased. I have seen
calibration kits assembled from inappropriate parts where the phases
difference drops to zero at one frequency. It’s obviously impossible to
calibrate then. But if one standard has a phase able of 0 degrees, and the
other 10 degrees, the calibration will be poor.

The whole issue is far from simple, but the way you are presenting the
information makes it difficult for anybody to follow you.

G8WRB


--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom

Yes ,indeed a 5V USB powerpack ,readily available ,even from supermarkets , will do fine.

For those needing a Li-Ion cell (nominally 3.7V) , I get these from discarded Laptop battery packs . These packs are discarded because usually only 1 of the 6 cells is no longer OK.
I take these packs to bits and charge each cell individually with an appropriate charger (usually good for charging 4 cells at the time) I then fit cells in 18650 cell holders available from Banggood and other on-line retailers.
There are 2 types of cell holders , for 1 cell and 4 cells.

WIth the cell holders I make multiple cell battery packs to feed my Yaesu FT-817 , QRP transceiver
For this transceiver I use 4 multiple cell units in series ,ensuring that the cells will be re-charged when the radio input voltage has dropped to 4*2.8V=11.2V To ensure a long life a Li-Ion cell should not be discharged below 2.8 V
The above just for info.
After all I am just a radio AMATEUR.

Frank , EI7KS

Hi Larry,
that's curious. Have you tried turning it off and on again, as they say? :-)

On the face of it, that looks exactly like what would happen if the device
was connected, and thus found, when the program started, but was
disconnected/turned off/set to DFU mode before attempting to connect. So
disconnecting the NanoVNA, turning it off, turning it back on and
connecting it again would be my first suggestion.

--
Rune / 5Q5R

YES! Thank you for the Rescan function, Rune.

However - it's throwing errors looking for COM12:

2019-09-27 07:45:32,042 - NanoVNASaver - INFO - Startup...
Settings: C:/Users/lrothman/AppData/Roaming/NanoVNASaver/NanoVNASaver.ini
2019-09-27 07:45:32,437 - NanoVNASaver.SweepWorker - INFO - Initializing SweepWorker
2019-09-27 07:45:32,579 - NanoVNASaver.NanoVNASaver - INFO - Found NanoVNA (0483 5740) on port COM12
2019-09-27 07:45:32,579 - NanoVNASaver.NanoVNASaver - DEBUG - Building user interface
2019-09-27 07:45:33,086 - NanoVNASaver.NanoVNASaver - DEBUG - Finished building interface
2019-09-27 07:45:45,613 - NanoVNASaver.NanoVNASaver - INFO - Opening serial port COM12
2019-09-27 07:45:45,614 - NanoVNASaver.NanoVNASaver - ERROR - Tried to open COM12 and failed: could not open port 'COM12': FileNotFoundError(2, 'The system cannot find the file specified.',
None, 2)
2019-09-27 07:45:49,982 - NanoVNASaver.NanoVNASaver - INFO - Opening serial port COM12
2019-09-27 07:45:49,982 - NanoVNASaver.NanoVNASaver - ERROR - Tried to open COM12 and failed: could not open port 'COM12': FileNotFoundError(2, 'The system cannot find the file specified.',
None, 2)

I tried to connect twice, hence the two INFO errors.

Regards
Larry

Thank you for the massive effort you have put into this software! I have had zero problems running previous versions with Windows 10, but this latest version AVG seems to think there could be a problem so it exports the file to test it. In the mean time AVG will not let me run the program.
73 G4XGN

17 : From A Common User's Point Of View

Hello,

Allow us, please, for the sake of completeness of
an appropriate preparation of a presentation for the
Estimation of the -sine qua non- Core of the Measurement
Uncertainty that Exists in *A N Y * VNA System, regardless
of what it really is, a VNA or a NanoVNA, facupov : that is
like that very one of ours, to also include here the initial
findings by us:

=
| Subject: vna ~ nanovna : (r,x) comparative results but no comments
| Sent: Tuesday, September 17, 2019 02:31
| To: [email protected]
| From: yin.oe3zgn.sv7dmc-pez.oe3zzp.sv7bax-arg yza@...
=
| Hello,
|
| 1 one-port box + adapter - initial version:
|
|
| 2 one-port box + adapter - modified version:
|
|
| 3 one-port box + adapter - modified version:
|
| black : vna system
| red : nanovna + 31 mm adapter
| blue : nanovna - 31 mm adapter mathematically
|
| r :
|
| x :
|
| Sincerely,
|
| yin&pez@arg
=
0 : /g/nanovna-users/message/2521

Sincerely,

yin&pez@arg

17

I just released 0.0.12:



This release of NanoVNA-Saver offers a number of new features, all of which
have been widely requested.

First of all, there's now the option of scaling the plots: right click them
for a menu, where it's possible to set the maximum and minimum values for
the frequency and data axes. Sadly not yet ready for the polar plots, and
mouse control of zoom is also pushed to a future release.

Second, it's not possible to have "bands" displayed in the frequency based
plots: Select "Display setup" to find the option for this. The default data
is for amateur radio bands - or you can put in your own.

Thirdly, the calibration procedure has received a new "calibration
assistant": A series of popup messages prompting you to switch between
calibration standards, and code to automatically sweep them for you and
store the results.

Finally, there's as always a number of bugfixes and stability improvements.

With more than 800 downloads of the 0.0.11 version, I can't wait to hear
what you all think of it this time - and I can't thank this community and
mailing list enough for the support, encouragement, suggestions and testing
you have provided!

I am interested in knowing what platforms you are getting this software
running on, *particularly* if you had had to jump through hoops or do
anything unexpected to get it to run: Do email me at mihtjel@... if
you can tell me what you had to do to make it work, so that I may update
the documentation, or make things easier to install in the future.

Thank you!
--
Rune / 5Q5R

qrp.ddc,

Thanks for confirmation( #1831 ) and additional advise.

Bug was confirmed and fixed in edy555 (ttrftech) commit 0b885f2. Beware older versions have a bug in S21 calibration.

Carlos

Hi all,
did someone of the group measure the initial charging current of the battery when almost empty?
My NanoVNA draws 900mA while connected to a 5VDC power supply! The current drops down to 850mA after 10min. For a 400mA, 1.48Wh battery that is for my opinion way to much.

73, Norbert, DG1KPN

If you carefully remove the for plastic screws you will have access to the screen cover. Simply peel it off and reassemble

Or use a Standard 5v USB Power Pack!
Enough choices Up to 25Ah