开云体育

Ken, great job with PCB material. Looks like a professional chassis (much better than mine). And thanks for the article on general fab'ing of chassis.

- Jeff, k6jca

Great work all :)

Thanks Ken.I've placed a copy of the PDF in the forum's files section under housing designs.?
73. Larry



On Mon, 14 Oct 2019 at 5:46 PM, Ken wa4mnt<wa4mnt@...> wrote: Hi all,

The link below is for the chassis I made for my NanoVNA device I recently received. I was concerned about damage to the rocker switch and the power slide switch. I have also included a little extra overall thickness for those wanting to use the cell phone battery mentioned on the list for longer life. I am not looking to sell these, I just wanted to show what can be done to protect it a little more and keep out some of the dirt. It can be found on the qrpguys.com "misc files" area if the link below goes south.



ken - wa4mnt
qrpguys.com

Do you have any gnuplot code which can import a Touchstone file and plot it on the Smith Chart?

I do, now. Having only this morning first looked at Touchstone S1p files,
I discovered that they are already in gnuplot format,
which seems unlikely mere coincidence.

Regardless, integrating Smith chart format with Touchstone plots
required learning about gnuplot's `set table` command.

Attached are the necessary files
* "smithgrid.p" is loaded >>one time only<< to generate 3MB file "smithgrid.dat"
- "smithloop.p" is called by "smithgrid.p".
- Once "smithgrid.dat" is generated, neither are needed again.
* "smithlabel.p" is called by "plotsmith.p" to format and label charts.
* "plotsmith.p" calls * "smithlabel.p", draws the grid using "smithgrid.dat"
and also plots S11 for any included S1p files.
- multiple copies of "plotsmith.p" may be wanted for various S1p file comparisons.

The reason anyone might want to bother with all this is because
gnuplot makes it pretty easy to plot multiple S1p files on a single Smith chart.

Gnuplot has a command line:

C:\Users\ormpoa>gnuplot

G N U P L O T
Version 5.1 patchlevel 0 last modified 2017-04-18

Copyright (C) 1986-1993, 1998, 2004, 2007-2017
Thomas Williams, Colin Kelley and many others

gnuplot home:
mailing list: gnuplot-beta@...
faq, bugs, etc: type "help FAQ"
immediate help: type "help" (plot window: hit 'h')

Terminal type is now 'windows'
Options are '0 color solid butt enhanced standalone'
Encoding set to 'cp1252'.
gnuplot> load 'smithchart.p'
gnuplot> replot "BNC.s1p" u 2:3 w l title "50 Ohm BNC S11"
-------------------------------------------------------------------------------------
Replacing "BNC.s1p" at that last prompt will plot S11 from whatever Touchstone files you have.
Replotting with more files draws them all on a single chart, facilitating comparisons.

#47 : Once Again

@Dr. David Kirkby from Kirkby Microwave Ltd - 14 October 2019 :
/g/nanovna-users/message/4907

Hello,

After your suggestion, allow us, please, to also suggest to you,
once again, after the previous one with our message:

25 : The concept of Quantity today - 1 October 2019 :
/g/nanovna-users/message/3106

to read -but now specifically- just the last proposition, of the third
paragraph from below, in page viii, of the Introduction to "VIM3", at:

[JCGM_200_2012.pdf]

packed in:



and after that, to please you, once more, to not bother yourself
anymore with a possibly loose terminology but to concentrate in
the essence of:

"how much is the uncertainty (or deviation or whatever other
name may it has) of the [AnyVNA] measurement results,
if someone -according to his taste, of course- wants to estimate it
by taking into account the given uncertainties of the -unquoted-
standards, as well as the inaccuracies of the readings"

that is on a matter with unknown answer until about 10 years
before.

Because, as you see, this has nothing to do with "translation problems"
or "language barriers" or whatever else may someone thinks that it is
the responsible of his "non-understanding", as we also already pointed
in our message:

#13 : @erik@... - 26 September 2019 :
/g/nanovna-users/message/3106

from which allow us, please, to repeat here the following excerpt:

| Finally, allow us, please, to comment that, in our humble
| opinion, regarding 'Understanding', there are the following
| types of human beings, according their personal tastes:
|
| (1) Those who don't want to understand, and those who want
| to understand, but when they don't understand then, according
| to their judging abilities, they put constantly the blame:
|
| (2) on the others,
|
| (3) on themselves, and
|
| (4) either on the others or on themselves, according to the state
| of their progress in the Knowledge

Sincerely,

gin&pez@arg

47#

Pretty happy with mine except that the little hatch for the cal terminations opens too easily:


John AE5X

On Mon, 14 Oct 2019 at 18:06, zl2arl <colin.larsen@...> wrote:

Just need someone to knock up an STL file so we can 3d print it ;)

Hi Colin,
there have been several threads about 3D printing a case.
I found a lot of hits by searching for 'case':
/g/nanovna-users/search?q=case
--buck

On Mon, 14 Oct 2019 at 17:32, Mel Farrer, K6KBE <farrermesa@...> wrote:

OK, but not knowing what that is, did anyone rewrite the manual in English? The words are all english but don't make a whole lot of sense. Reminds me of the days when the off shore boys wrote the operational manuals for ham radios, UGLY.

Some background might help.
You didn't buy a commercial product with an R&D division, marketing,
and support departments.
You bought one man's hobby project; one that he open sourced.
The Chinese industrial system found it and began producing them -
that's how we ended up with one.

The originator, Tomohiro, has a Github where he released the firmware;
the software that runs on the device itself. Also in that package are
Python programs that allow one to interact with the device from a PC,
Mac, *nix, etc. His 'handle' is 'edy555'. Tomohiro is Japanese;
English is not his first language. A Chinese programmer has been
modifying and enhancing the edy555 firmware; that is 'hugen'. Hugen's
first language is not English. Hugen has released a PC application
that is more polished than the original Python scripts. There are
other PC-side developers as well as people working on the firmware.

We are reaping the benefits of early access to the physical device and
to the firmware that runs on it, and to the software being developed
for the PC. The downside, if one can call it that, is that virtually
all of the work is being done by people for whom English is not their
primary language. In addition, the software changes are very frequent:
people on the list are almost certainly discussing software that
didn't come on your particular device from the factory.

There are two areas in this group that might prove useful for
self-education. The Files section, and the Wiki. Since this is
actually quite early in the life of the NanoVNA, neither resource is
all-encompassing. But several people have been continuously improving
them as time allows. In particular, the Wiki is a resource that any
one of us can edit/enhance - anyone can contribute a note or a brief
writeup that would help the next newcomer...

OK here is where I am. I have a rudimentary knowledge of the NanoVNA and have walked through a lot of the set up. NO where in the manual does it tell you step by step how to get rid of the Smith chart overlay.

The Smith Chart is tied to one of the traces. Turn them all off. On
the NanoVNA, select Trace, then de-select all of the traces. Voila, no
Smith Chart.
Now, turn one trace on at a time. The description of the current
assignment appears in the upper left.
If you'd like to re-assign a visual graph to a specific trace, choose
one of the traces. Note that there are two traces for CH0 and two for
CH1.
Select the trace you'd like to re-assign.
Press Back. You should see the menu with Trace, Format, Scale,
Channel, Transform'.
Press Format. You should see the menu with the various graph types,
'LOGMAG, PHASE, DELAY...'
Press the format you prefer.
You've now assigned your choice of graph to the trace.

Next, nothing on interface to the computer NADA. Nor does it tell you how to download new revisions.

Much of that is in the Wiki and Files section. As I said, we're still
in the early days, so help organising things is welcome. The thumbnail
is that there are several PC-side programs. Look for NanoVNA-Saver.
I'm old fashioned, so I prefer to go direct to the author:


Welcome to the community! I hope some of this was of use.
73 de kc2hiz
--buck

From: Mel Farrer, K6KBE wrote: NO where in the manual does it tell you step by step how to get rid of the Smith chart overlay. Next, nothing on interface to the computer NADA.

If you choose "Display" then "Trace", you will see the four traces are color coded. If you tap on a tracex button and the color goes away, that will turn off the display for that tracex.

Info on PC interface at:

Just need someone to knock up an STL file so we can 3d print it ;)

Any takers?

That can be a problem with a decentralized project.

Mel, do you want to meet on 80 meters later? I’m at my wife’s place in Nevada City, so I’d think propagation along the foothills ought to be good. Much more efficient to talk through issues rather than type back and forth.

Let me know if this works for you. I’m sometimes on 3663 around 5:15. But pitch a time and frequency that works best for you.

By the way, regarding the serial port...if you plug the included cable into your computer’s USB port and the other end into your NanoVNA, it will look like a device talking through a serial port (I think it defaults to comm port 12)

Anyway...if you have downloaded the NanoVNA-Saver .EXE file...

1. Plug NanoVNA into included cable,
2. Plug other end of included cable into a USB port on your PC.
3. Turn the NanoVNA ON.
4. On your PC, click on the NanoVNA-Saver icon (or filename) to launch it.
5. The app should launch, and down in the left hand corner it should say “COM12” in the “Serial Port” field. (If you don’t see a comm port listed, something g is probably bunged up).
6. Assuming you see a com port listed, click the “Connect to NanoVNA button just below it. (this button will then change to say “Disconnect” if a connection has been established).

You can then use the Sweep button on the upper left to make sweeps.

Anyway — I’d be happy to get on the air, too, if you’d like.

- Jeff

Nicely done Ken.

I too am concerned about junk getting into the open areas. Thanks

Mel, K6KBE

Hi all,

The link below is for the chassis I made for my NanoVNA device I recently received. I was concerned about damage to the rocker switch and the power slide switch. I have also included a little extra overall thickness for those wanting to use the cell phone battery mentioned on the list for longer life. I am not looking to sell these, I just wanted to show what can be done to protect it a little more and keep out some of the dirt. It can be found on the qrpguys.com "misc files" area if the link below goes south.



ken - wa4mnt
qrpguys.com

OK, but not knowing what that is, did anyone rewrite the manual in English? The words are all english but don't make a whole lot of sense. Reminds me of the days when the off shore boys wrote the operational manuals for ham radios, UGLY.

OK here is where I am. I have a rudimentary knowledge of the NanoVNA and have walked through a lot of the set up. NO where in the manual does it tell you step by step how to get rid of the Smith chart overlay. Next, nothing on interface to the computer NADA. Nor does it tell you how to download new revisions. So call me a newbie and I am with 60 years developing communication and testing products from DC to 40 GHz. To say I am at a loss on this is an understatement. Comments appreciated, GRIN. I need help.
--
Mel, K6KBE

On Mon, 14 Oct 2019 at 19:44, yza <yzaVNA@...> wrote:

#46 : Comment

@Dr. David Kirkby from Kirkby Microwave Ltd - 14 October 2019
/g/nanovna-users/message/4890

Hello,

Thank you for your suggestion.

However, in our humble opinion, putting the name into quotes
is adequately enough to clarify the concept without disturbing
the connection with the well-known calibration technique having
it in its title.

Sincerely,

gin&pez@arg

I am *not* a metrologist, but I find this document useful

“A Beginner’s Guide to Uncertainty of Measurement”. It is written by a lady
at the National Physical Laboratory (NPL) in the UK.



I realise that you are metrologists, but with English not being your
first language, maybe you use different terms to us.

I will quote a little from that document:

“ *2.3 Error versus uncertainty*
It is important not to confuse the terms ‘error’ and ‘uncertainty’.

*Error* is the difference between the measured value and the ‘true value’
of the thing being measured.

*Uncertainty* is a quantification of the doubt about the measurement result”

At far as I am aware, you don’t know the true value of anything relevant to
the VNA. Since you don’t know the true value of anything, you can not
calculate an error.

I realise that the term “error correction” is used in by engineers using
VNAs, so I am not suggesting that you remove the word word error. But I
would suggest that you should probably be using the word “uncertainty” in
your title.

I am not following the work you are doing, so don’t know exactly what you
are doing. But I suspect that the word uncertainty should be in the title
of your document, but maybe I am mistaken.

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

Of course: Leakage, not noise. Thank you. :-)

--
Rune / 5Q5R

On Mon, 14 Oct 2019 at 22:59, Dr. David Kirkby from Kirkby Microwave Ltd <
drkirkby@...> wrote:

On Mon, 14 Oct 2019 at 19:13, Rune Broberg <mihtjel@...> wrote:

Preferably, with a 50 ohm load on both ports. If you only have one, put

it

on "ch1" (port 2 - confusing numbering).

Isolation tries to establish and cancel out the base level of noise in

the

passive channel of the device.

(At least that's how I've been taught it)
--
Rune / 5Q5R

Noise is a random error that can not be cancelled by the calibration
procedure.

The calibration procedure attempts to remove only systematic errors, one of
which is internal leakage between different parts of the VNA, or leakage
externally to the VNA. The isolation measurement attempts to remove the
leakage.

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

On Mon, 14 Oct 2019 at 19:13, Rune Broberg <mihtjel@...> wrote:

Preferably, with a 50 ohm load on both ports. If you only have one, put it
on "ch1" (port 2 - confusing numbering).

Isolation tries to establish and cancel out the base level of noise in the
passive channel of the device.

(At least that's how I've been taught it)
--
Rune / 5Q5R

Noise is a random error that can not be cancelled by the calibration
procedure.

The calibration procedure attempts to remove only systematic errors, one of
which is internal leakage between different parts of the VNA, or leakage
externally to the VNA. The isolation measurement attempts to remove the
leakage.

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

Mel Farrer, K6KBE wrote: Please explain edy 0.2.3 SW

I see it called edy255 and also edy555 so I didn't know which number to post.

Thank you. You are doing great work.

#46 : Comment

@Dr. David Kirkby from Kirkby Microwave Ltd - 14 October 2019
/g/nanovna-users/message/4890

Hello,

Thank you for your suggestion.

However, in our humble opinion, putting the name into quotes
is adequately enough to clarify the concept without disturbing
the connection with the well-known calibration technique having
it in its title.

Sincerely,

gin&pez@arg

46#