Re: Owen Duffy on improvised test fixtures
#test-jig
It's been my experience that those who can, do. Those who can't, criticize. I'm sure Rune would appreciate suggestions as to how to improve his software. But, at least he gave us a start. It's up to us to help develop the application.
My nickel's worth.
Bruce Nebergall / K4TQL
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Hi Rune
I would not expect measurements made outside of the frequency range of the current calibration to be "accurate".
I would not want nvna-s to change the sweep setup when a calibration is loaded. But I might expect to be reminded.
Having loaded a calibration how about warning the user if they try to make measurements outside the calibrated frequency range?
e.g. by flashing up an out of calibration message box, watermarking the plots etc.
73
Nick
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On Thu, Oct 17, 2019 at 08:04 PM, Rune Broberg wrote: I agree that calibrations should save the start/stop/segments/averaging.
It's a great point. I don't know if I want to overwrite whatever frequency
span the user has set up when they load the calibration, though. It's a
matter of doing what the user expects, and I'm not sure I would expect
loading a calibration to change my sweeping setup?
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Re: errors of "error" models
#57 : ann : [LeastVNA] ~ [NanoVNA] later today 57#
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Re: errors of "error" models
Dr. David Kirkby from Kirkby Microwave Ltd
On Fri, 18 Oct 2019 at 11:43, yza <yzaVNA@...> wrote: #55 : just because this is research in progress : #55 Many people report work that¡¯s in progress, but report it in a way others can at least see what is the aims of the work. The title should give some indication of what the work is about, but even your title is confusing. I just did a search for ¡°amplifier work in progress¡± Here are the first two links I found. I did not read any more than the first paragraph of each, but they are at least presented in a way that others can follow. despite they are a work in progress. Here is a description for children on how to make graphs. We see a title on the graph, the x axis is the year, the y-axes is the population. I don¡¯t know at what age graphs are taught to children in the UK, but I am sure by the age of 14, children would know that you need to put labels on the axes! It is such a basic thing, yet you don¡¯t even label the axes! When I write software, even if just for my own use, I will put at least some comments in the code. Have you considered putting your work onto a webpage, that people could read and understand without clicking links? Have you considered writing it like a basic scientific report? Earlier I wrote that I would try to correct the English if you could write the work in an understandable way. That offer still stands. 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
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The IP5303 inverter section is running at 350KHz when running off of the internal battery. That will create a pile of noise.
For a good sense of supply line noise, the IP5303 needs to be removed/disabled and a well filtered 5V linear supply used as Erik mentioned earlier.
That is why I suggested running off a 7.2V lithium pack, using a linear 5v regulator with low noise and transient specs.
The service manuals for various VNA analysers are all over the Web - have a look at how they filter their power sources.
A good source of manuals is:?
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On Friday, October 18, 2019, 3:16:34 a.m. GMT-4, erik@... <erik@...> wrote: On Thu, Oct 17, 2019 at 01:02 PM, Dave Daniel wrote:
has anyone measured the +5 V rail(s) to see how noisy they are?
USB power is very noisy. Hugen79 designed the power part of nanoVNA different from edy555 Hugen79 uses the output of the IP5303 for 5 volt where edy555 uses the USB power. Did not check noise on IP5303 output but when the nanoVNA is running on internal battery noise is less so I assume its very high frequency noise coming from the USB VBUS, leaking through the IP5303
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Re: errors of "error" models
#56 : our [OPEN] ~ [SHORT] 'standards' in our [NanoVNA] and our [VNA] Hello, Allow us, please, to present our comparative results for the indications or readings taken with our [OPEN] and [SHORT] 'standards' as they were measured on the same Reference Plane * with our [NanoVNA] and our [VNA], which have as follows: I/II Measurements with [VNA] : BLUE = [SHORT], CYAN = [OPEN] [Magnitude] vs [Frequency] in Antilog vs MHz: [Argument] vs [Frequency] in Degree vs MHz: II/II Measurements with [NanoVNA] : RED = [SHORT], MAGENTA = [OPEN] [Magnitude] vs [Frequency] in Antilog vs MHz: [Argument] vs [Frequency] in Degree vs MHz: and take into account, please, that both instruments have the "same" Characteristic Impedance only because they were named by their manufacturers with the same Nominal Value of 50 OHM. * #50 : The Full Final Report 1 : - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Nominal Values Zinp = ( Rinp , Xinp ) of our Standard [ref2007box], in terms of frequency, using [NanoVNA] and [VNA] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - [NanoVNA] ~ [VNA] Comparison 16 October 2019 /g/nanovna-users/message/5061Sincerely, gin&pez@arg 56#
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Re: errors of "error" models
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On Thu, Oct 17, 2019 at 08:01 PM, Rune Broberg wrote:
I *think* the Cs/Ls you are after is already shown in the marker data
display? It's what's shown as "L equiv."/"C equiv."
The series resistance is the resistive part of the impedance display.
Hi Rune, OK, so this this may just be down to terminology after all. I guess what I'm looking for is something like the marker information presented in the AIM VNA software (see attached). Having both Series and Parallel values displayed saves a lot of time if you are trying to work out values for matching networks. I assume that these are calculated using the following formulae, but only the inductance or capacitance value is shown as appropriate Rs = Zmag*cos (phase) Xs = Zmag*sin (phase) Rp = ( Rs^2 + Xs^2 ) / Rs Xp = ( Rs^2 + Xs^2 ) / Xs Ls= Xs / ( 2 * Pi * f ) Cs = 1 / ( 2 * Pi * f * Xs ) Lp= Xp / ( 2 * Pi * f ) Cp = 1 / ( 2 * Pi * f * Xp ) Q = Rp / Xp = Xs / Rs Rp = Rs ( 1 + Q^2 ) Regards, Martin - G8JNJ -- Regards, Martin - G8JNJ
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Re: Purchase sources 4.3 inch NVA
From: ambaer52@... I understand that there is a 4.3 inch version available. Has anyone purchased one? If so, I am in the US. Where is a reliable source to purchase one? ========================= I bought one and it works well, also working with Rune's nanoVNA saver. I bought here: but I see it's now: and there's a support group here: /g/nanovna-f/messagesCheers, David -- SatSignal Software - Quality software for you Web: Email: david-taylor@... Twitter: @gm8arv
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Re: Owen Duffy on improvised test fixtures
#test-jig
The Antenna Analyzer made by EU1KY was further developed by Ian, KD8CEC, it used a similar calibration solution here. It is important for L / C measurement when you use open, short circuit, and load 50 Ohm calibration elements on millimeter-accurate spikes of the same size. As I have been following and building the EU1KY AA myself, you can read more on my website that interests me.
73, Gyula HA3HZ
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Re: errors of "error" models
Dr. David Kirkby from Kirkby Microwave Ltd
Wed, 16 Oct 2019 at 23:02, yza <yzaVNA@...> wrote: #51: the full final report 1 with contiguous full online images is here:
51#
I tried to follow what you consider is your ¡°report¡±, but it has a *very* different style to any report I have seen written by students or professional. I would expect to see any professional report as s PDF or similar file that could be printed out and read. Instead you expect people to keep clicking various links. It is normal practice to have labels on the axes of graphs, but one has to guess what the axes mean in your ¡°report¡±. I assume that the x-axis is frequency in MHz, but I have no idea what the y-axis is. Sometimes there are multiple lines on the same graph. They be of different different colours or dashed, but the reader has to guess what the various lines are. I downloaded your Fortran some weeks ago. There is no makefile and no comments in the source code. It would not compile with my Fortran compiler. Gary seems to be hanging in there, but I have personally given up trying to follow your material. If you ever manage to write this up in the format of a convention report or scientific paper, please let me know. 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
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Using some generous amplification after the 2GHz filter the nanoVNA performance for S21 measurements is getting to a usable level.
Attached S21 of a 2GHz cavity filter. It proves the SA612 has a lot of headroom when you eliminate the fundamental
Next step is to test a high pass filter to get rid of the fundamentals so it will also become possible to measure S21 of low pass filters
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On Thu, Oct 17, 2019 at 01:02 PM, Dave Daniel wrote:
has anyone measured the +5 V rail(s) to see how noisy they are?
USB power is very noisy. Hugen79 designed the power part of nanoVNA different from edy555 Hugen79 uses the output of the IP5303 for 5 volt where edy555 uses the USB power. Did not check noise on IP5303 output but when the nanoVNA is running on internal battery noise is less so I assume its very high frequency noise coming from the USB VBUS, leaking through the IP5303
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The xc6206 is terrible in transient response. Max input voltage is 6 volt so I use only 5 volt from linear regulator.
The SA612 can have up to 8 volt but no big gain in performance
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Re: Problem with cho45 web interface
May be the compilation problem caused by the flash usage limit, I have re-compiled after removing the sin/cos table in my firmware, now it can connect to the web interface normally.
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Hi Rune ,thanks for your attention. the feature of recalling CALIBRATION file changing the settings of nanovna
is usaul on vna I used at works for some year. The calibration is valid if you don't change the parameter used during the calibration process.
The hp agilent vna put a warning , if you change some parameters the current calibration may be not valid, and in some case automatically turn it off.
IZ1MDJ Maurizio
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On Thu, Oct 17, 2019 at 09:04 PM, Rune Broberg wrote:
Hi Maurizio,
I'm glad you're enjoying the new version :-)
I agree that calibrations should save the start/stop/segments/averaging.
It's a great point. I don't know if I want to overwrite whatever frequency
span the user has set up when they load the calibration, though. It's a
matter of doing what the user expects, and I'm not sure I would expect
loading a calibration to change my sweeping setup? That's my thought for
now, at least.
Showing the marker values on the charts themselves for the values displayed
on the chart is an interesting idea. I will put it on the list of new ideas!
--
Rune / 5Q5R
On Thu, 17 Oct 2019 at 15:29, Maurizio IZ1MDJ <redifon500@...> wrote:
Hi Rune , very happy for the new improvement on the 0.1.3 of nanovna-saver.
Suggestions for the future version :
1 Save the settings of nanovna , start stop center number segments , sweep
mode , when saving the calibration ,not necessary as separate file , better
in the same file. Recalling calibration file , the parameters will be
update automatically.
2 Have a marker over the graphic for the main parameter , as a choice
instead to display all data.
Many thanks again for your effort to improve the SW that is making the
nanovna a very powerfull piece of hardware.
Best regards
Maurizio IZ1MDJ
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Re: Owen Duffy on improvised test fixtures
#test-jig
Daniel, can you add a picture? Sma female on a board, or just a couple of short wires to a female?
Jim, KA6TPR
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Re: NanoVNA WebApp USB question
? Jacon Zar posted a couple of good links to type C configurations on Oct 13 in Msg. #4856 ?
"Oristo, I just googled this term "USB TypeC CC resistor" and read docs from ST & Cypress that appeared:
(page 8)
You may do the same..."
I found these interesting, explained why my cell phone charges high speed sometimes and normal speed others. Just turn the cable over. :-)
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gin&pez@arg
David J Taylor
Gyula Molnar
Starsekr