Re: errors of "error" models
#42 : The compact SLO formula for [AnyVNA] Hello, Allow us, please, to inform you that our two final reports: 1 : #30 : 5 October 2019 : /g/nanovna-users/message/41792 : #38 : /g/nanovna-users/message/4293are resulted after we used the formulas given at: #16 : 27 September 2019 : /g/nanovna-users/message/3161with the clarifications provided at: #17 : 27 September 2019 : /g/nanovna-users/message/3192for the following Nominal Values of SLO "standards": Short : A := S = Polar : ( 1 , 180 ) = Cartesian : ( -1 , 0 ) = Complex : -1 + j0 = Real : -1 Load : B : = L = Polar : ( 0, undefined) = Cartesian : ( 0, 0 ) = Complex : 0 + j0 = Real : 0 Open : C := O : Polar : (1 , 0) = Cartesian : ( 1 , 0) = Complex : 1 + j0 = Real : +1 and the following Indicated values of our [NanoVNA] and [VNA] Short Indication : a := s Load Indication : b := l Open Indication : c := o Unknown load Indication : gamma substituted to: to got the following minimal mathematical expression for the Unknown Gamma measured by [AnyVNA] - all complex: at each defined frequency. Sincerely, gin&pez@arg #42
|
Firmware upgrade - Touchscreen not working
Touchscreen works for main menu, but I can't go to any sub-menus. Menus all work with toggle/PB.
I've tried several different firmwares and they all load correctly, but no touchscreen sub-menus.
Any ideas for a fix ?
Thanks,
Andy -W4KIL
|
Re: What's important ? - Discuss
Rotary encoder available on eBay from many vendors, search for Rotary encoder with switch.
One example at
|
Re: Can the NanoVNA be used on 75-ohm antennas/cables?
You know, after all the talk about matching impedances, I'm really
wondering .... we talk about POWER in watts but that's pretty much for
transmitters. But we talk about receivers in? VOLTS. Well, okay, microvolts,
usually. Somehow, I don't see a good reason to CARE about matching
receiver input impedance. Maybe it lowers the antenna bandwidth or Q?
Impedances have PHASE, but voltages do not. Care to comment?
Bill
- - - - - - - -
toggle quoted message
Show quoted text
On 10/12/19 6:50 AM, Dr. David Kirkby from Kirkby Microwave Ltd wrote: 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
|
Re: Please change project name: NanoVNA V2
I am 99.99% sure that the $17 are a scam. Among my many eBay purchases (3 pages so far of 2019 order history), the only real scam not reported to me by eBay was for a used electric guitar. Two orders from overseas played the free gift to trick reported delivery time, but nearly all arrived within originally cited delivery windows. Defective items are another story... most incorrect items were from North American sources.
|
Re: Please change project name: NanoVNA V2
The main work looks to be in the software Value and profits increase when hardware, firmware and software integrate nicely and require minimal printed documentation.
|
Re: Please change project name: NanoVNA V2
Dr. David Kirkby from Kirkby Microwave Ltd
On Sat, 12 Oct 2019 at 17:49, W5DXP <w5dxp@...> wrote: 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. Agreed. It¡¯s wonderful device for the money. I wonder how many total NanoVNAs, have been manufactured and how anyone could be selling them for $17? I am 99.99% sure that the $17 are a scam. I bought one for $20 or so, but I don¡¯t believe that it will ever arrive. 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
|
Re: Please change project name: NanoVNA V2
Dr. David Kirkby from Kirkby Microwave Ltd
On Sat, 12 Oct 2019 at 17:16, Daniel Marks <profdc9@...> wrote: 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. Thank you. The 30 MHz lower end on frequency m would limit its usefulness to me. There are a *lot* of designs coming out for VNAs. The main work looks to be in the software - perhaps the reason software options can cost more than the hardware for commercial VNAs.. I believe a Keysight FieldFox with all the software options would cost more than twice the price of the same instrument with no software options. 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
|
Re: Yet another NanoVNA PC app
Some firmware versions, 0.2.0 to 0.2.2, could show some problems with
repeated "sweep" commands with no or short delay between them. It should be
fixed in 0.2.3, so maybe that's it?
There were some older firmware versions that had significant data transfer
problems, I think back in August or so. Could be it as well. But if you're
not seeing it when using other software, it's not obvious what the reason
is.
--
Rune / 5Q5R
toggle quoted message
Show quoted text
On Sat, 12 Oct 2019 at 17:44, Nick <g3vnc@...> wrote: 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.
|
Re: Yet another NanoVNA PC app
there is some corruption of the data as received by the application Have you tried inserting a USB 2.0 hub between nanoVNA and Linux PC?
|
Re: Please change project name: NanoVNA V2
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?
|
Re: Yet another NanoVNA PC app
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.
|
Re: Please change project name: NanoVNA V2
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
|
Re: Yet another NanoVNA PC app
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
toggle quoted message
Show quoted text
On Sat, 12 Oct 2019 at 18:09, Nick <g3vnc@...> wrote: 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?
|
Re: Yet another NanoVNA PC app
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?
|
Re: VNA Help for microwave analyzers
YES THIS LINK WORKS AND IS EXCELLENT.
SO GO FOR IT.
ALAN
|
Re: VNA Help for microwave analyzers
Us this link as I believe the other is broken or changed or I got it wrong!
Not sure.
|
Re: Please change project name: NanoVNA V2
Dr. David Kirkby from Kirkby Microwave Ltd
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
|
Improving performance between 900MHz and 1.5GHz
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
|
This seller looks iffy selling nanoVNA's
and they are selling 3d printers for the same price, delivered. I really don't think so. I will give this one a miss.
|
gin&pez@arg
Oristo
