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Tomohiro, you have given me the most performance for the least cost of any electronic device that I can remember and I can't thank you enough. I wonder how many total NanoVNAs, have been manufactured and how anyone could be selling them for $17?

I am of course using nanovna-saver for serious measurements! Were it not for your excellent app the nanovna would be gathering dust in my desk drawer by now.

I started this somewhat academic exercise with nanovnasharp to see if a native windows app that depends on a windows device driver could be made to run on linux using Wine.

What I found of course is that it will not work if there is no equivalent driver available in linux.

So this gave me an excuse to try out virtualbox.

Do you have any theories as to why there is lost scan data? I saved .s1p and .s2p files and opened them with nanovna-saver and the corruption was still there. There's nothing useful in the virtualbox logs so am at a bit of a loss to explain it.

You might want to check out this project



as a starting point for a design with more bandwidth. Alas, the licenses
are not specified, as usual, making using or marketing this design
difficult.



On Sat, Oct 12, 2019 at 11:34 AM Dr. David Kirkby from Kirkby Microwave Ltd
<drkirkby@...> wrote:

On Sat, 5 Oct 2019 at 16:33, <edy555@...> wrote:

Hello folks,

I'm edy555, the original developer of NanoVNA.

Hello edy555. I see plenty of references to you, but I found your email and
hope that you can answer my question.

And in addition, I have a plan to develop a new design of VNA my own, which

has extended frequency range.

Can you please give us a *very* approximate time scale for this? Do you
have plans to use a larger screen? The size of the screen is the single
most annoying aspect I find of the NanoVNA. I appreciate that a large
screen maybe the most expensive component. I personally would be willing to
pay more for that.

I am tempted to buy a NanoVNA-F, but I am a bit worried about the firmware
development on that. If you came out with a model with a larger screen, I
would almost certainly buy it.

It would be nice if you produce a webpage giving the link to any website
where you sell your version, plus any authorised distributors. Then people
would know at least one decent source. Currently there are several people
claiming to be authorised distributors of NanoVNA, claiming there’s is
better.

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

I'm not trying to convert anyone, but is there any particular reason you're
not using NanoVNA-Saver, which runs natively on Linux? :-)

--
Rune / 5Q5R

Nanovnasharp will run on Linux Mint 19.2 using virtualbox, which emulates everything right down to the hardware, so it is possible to install a Windows kernel mode driver.

Here's the steps...

- create a new 32 bit virtual machine running Win7+SP1
- enable USB on the VM for the STMicroelectronics Virtual COM Port
- run the VM
- install dotnet40
- install VCP_V1.5.0_Setup_W7_x86_32bits.exe which created COM3
- run NanoVNA.exe
- switch on the nanovna
- hit Connect - worked first time!
- hit Get Data - it sort of works.

Unfortunately there is some corruption of the data as received by the application. There is no corruption on the screen of the nanovna itself.

Attached 2 pictures; good shows what it should look like, bad is what it looks like 9 out of 10 scans. The anomalous spikes appear in apparently random places and in varying number on the scan.

There is a 7MHz BPF connected to the nanovna.

Has anyone seen anything similar with this app?

YES THIS LINK WORKS AND IS EXCELLENT.

SO GO FOR IT.

ALAN

Us this link as I believe the other is broken or changed or I got it wrong!

Not sure.

On Sat, 5 Oct 2019 at 16:33, <edy555@...> wrote:

Hello folks,

I'm edy555, the original developer of NanoVNA.

Hello edy555. I see plenty of references to you, but I found your email and
hope that you can answer my question.

And in addition, I have a plan to develop a new design of VNA my own, which

has extended frequency range.

Can you please give us a *very* approximate time scale for this? Do you
have plans to use a larger screen? The size of the screen is the single
most annoying aspect I find of the NanoVNA. I appreciate that a large
screen maybe the most expensive component. I personally would be willing to
pay more for that.

I am tempted to buy a NanoVNA-F, but I am a bit worried about the firmware
development on that. If you came out with a model with a larger screen, I
would almost certainly buy it.

It would be nice if you produce a webpage giving the link to any website
where you sell your version, plus any authorised distributors. Then people
would know at least one decent source. Currently there are several people
claiming to be authorised distributors of NanoVNA, claiming there’s is
better.

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

The current firmware has problems measuring above 900MHz.
As example below a 1000 point scan of the "Open"
In my home build VNA I found that increasing the IF could help reducing noise.
As a test I increased the IF in the nanoVNA from 5kHz (as used in the first scan) to 12kHz.
As you can see in the second scan, using the same calibration data, the performance has increased.
There is more to test before I can release this.
Sadly this change does not help above 1.5GHz. Either the bridge has lost all directivity of the remaining SNR is too low to get a relevant signal

and they are selling 3d printers for the same price, delivered. I really don't think so. I will give this one a miss.

The NooElect ad mentions a case too but I don't see it pictured. Think I'll order one. You can never have too many nanoVNAs.

From the picture, this version is very similar to the version I made, obviously not from ttrftech (edy555), and they made some mistakes to the picture. There is a high probability of fraud, please be cautious!

hugen

I think it just means that they are the first to get "authorized" to sell for ttrftech which seems to be associated with edy555 the original designer. I have had good experiences with nooelec and think that they are okay. For the extra money it looks like you some extra cables and attenuators. I wonder if the cal kit is better than the usual one?

Unfortunately they only ship within the continental USA but they have a really nice selection at good prices.?


On Sat, 12 Oct 2019 at 9:42 AM, Oristo<ormpoa@...> wrote: > Well at least I tried to raise the issue :-)

Folks might care more if firmware optionally supported
replacing multi-function switch by e.g. rotary encoder with pushbutton

Well at least I tried to raise the issue :-)

Folks might care more if firmware optionally supported
replacing multi-function switch by e.g. rotary encoder with pushbutton

Try to save 2 times in a row.
I use this firmware on my two devices, it is used by my friend, there are no problems. Perhaps you are not using a reset during calibration.

Well at least I tried to raise the issue :-)

So I guess it's back to the endless calibration threads.

Thanks for suggesting the 'mute' option.

Regards,

Martin - G8JNJ

Found a nice website from Jacques Audet, VE2AZX, (English and French)

added to /g/nanovna-users/wiki/External-links

On Sat, 12 Oct 2019 at 03:37, Starsekr via Groups.Io <Starsekr=
[email protected]> wrote:

David,
Could you give the group a short form on how this is done, and what a
NanoVNA user would do and see to measure something like a piece of RG6 or a
75-300 ohm transformer? Not to take away from your sales, but what kind of
error would a pad made from 1% carbon resistors introduce, compared to a
commercial pad?

I don’t sell 75 ohm kits, neither do I sell matching pads - only 50 ohm
kits and consultancy services.

I heard a report somewhere on here that the receiver port on the NanoVNA
is not particularly close to 50 ohms and varies on the batch a given device
is from. That’s something I would like to fix myself, which could be done
with a few 1% resistors, after measuring the impedance.

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 Sat, 12 Oct 2019 at 05:53, Larry Benko <xxw0qe@...> wrote:

Dave,

Please educate me. Suppose I build a product that has a SMA-F connector
on it and you and I are going to measure S11 for my product. The only
way we are able to get the same answer is if there is an agreed upon
definition as to where within the mated SMA connectors we are going to
call the reference plane. Agreed?

The MIL standard for the SMA connector defines the reference plane.

The most accurate way to calibrate my measuring equipment is to connect

a cable to it that is terminated in an SMA-M connector and then
calibrate it with calibration O/S/L standards that have SMA-F
connectors. This eliminates any adapters being needed. Agreed?

Yes. agreed.

Since my O/S/L standards have some physical length I will need to move
the reference plane closer to the measuring equipment by some small
amount. To my way of thinking this can be done either by the measuring
equipment automatically of manually by doing some line extension.

Is this incorrect?

*No, that’s wrong.*

You should

1) Configure the 8753 to use the 85033D coefficients. From memory, that’s
something like

CAL (physical button on 8753)
Select Cal kit (soft key)
Press the soft key corresponding to the 85033D.
Return

Now just calibrate the instrument properly, then make your measurement.
There’s no need to mess around adding any delays - as Alan pointed out,
that will screw your results up

Larry, W0QE

Dave, 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