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Re: Evaluating clamp on ferrite chokes
For these frequencies, the key is the number of turns. You need a ring (not a snap-on cylinder), and thread the coax as many times as you can through it. If your application is QRP or RX only, use thin coax (like RG-174).I have a suspicion that they are not the right material for the low frequencies involved (3.5-14 MHz). A single snap-on only helps on VHF. You need a dozen of them to see a difference. 73, Mike AF7KR |
Re: NanoVNA V2
Additional tidbits of information.
1. The V2 PCB is 4 layers. 2. The schematics will be posted soon, at the same time as the launch on taobao, 3. Design objectives include keeping BOM cost below $100 and compatibility with current software base. A contact located in China indicated that the schematics are available now but only via private request. I haven't seen any info regarding screen size, but Hugen has posted in the past about prototyping with a 3.5-inch LCD. I would expect something that size or larger to keep up with the nanoVNA-F that is now being sold. |
Re: What is the minimal screen resolution for nanovna-saver?
Hi Rune,
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I asked because some programs require minimal resolutions, otherwise dialog boxes etc. are cut off. Good to know that this is not the case with nanovna-saver. Regards, Arndt Am 24.09.19 um 16:22 schrieb Rune Broberg: It doesn't *require* any particular resolution, but the interface only fits |
Re: NanoVNA Saver
It almost looks like you already have! ;-)
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I'll definitely consider it. -- Rune / 5Q5R On Tue, 24 Sep 2019 at 16:19, Larry Rothman <ac293@...> wrote:
Hi RUne, |
Re: What is the minimal screen resolution for nanovna-saver?
It doesn't *require* any particular resolution, but the interface only fits
in the vertical direction if there's at least ~750 pixels. So there would be scroll bars. It's not the end of the world. :-) -- Rune / 5Q5R On Tue, 24 Sep 2019 at 16:00, diesolinger via Groups.Io <diesolinger= [email protected]> wrote: Hello, |
Re: on the comparisons
Hi Erik
Super, I will test it within a couple of days as I am on a job where T-Check will be made Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] <[email protected]> P? vegne af erik@... Sendt: 24. september 2019 11:52 Til: [email protected] Emne: Re: [nanovna-users] on the comparisons Kurt, Allow me to share my T-check excel spreadsheet. Copy your 2 port touchstone data into the yellow cells and the graph will show the deviations Hope I did not make a mistake in the calculations. |
Re: on the comparisons
Reginald, if you can spare a moment or two, please contact me off list. Thanks. John at radio station VE7AOV. +++++if455kc@... On 2019-09-23 7:38 p.m., Reginald Beardsley via Groups.Io wrote: I think this promises to be a very interesting thread. ...-- |
Re: NanoVNA V2
Pierre Martel
Hi to everyone,
About the nanovna2. I really dont mind the screen size. I have the first one and find it ok. The only thing is that if used outside it is low in lights. But the size, not a problem, I have glasses and that what they were ordered for, helping me see smaller thing clear. the size of the beast is what I am looking for as I can take this little gem and brint it with me in my shirt pocket on the top of the tower. And if I need a bigger screen I can run nanovna Saver to display the result on my laptop screen. Heck I could even make a small 3d printed box with a nanovan, a raspberry pi4 and a touch lcd screen and run all this out of a few lipo battery to have a nice large display. But it would not floor me in top of the tower up to that point. Making it run up to a few ghz on the same screen for about the same price would be for me the best selling point of a nanovna2 Size does matter, but not always for the same reason. Le mar. 24 sept. 2019 ¨¤ 07:45, Dr. David Kirkby from Kirkby Microwave Ltd < drkirkby@...> a ¨¦crit : On Tue, 24 Sep 2019 at 11:01, <erik@...> wrote:If you want a really big screen you can easily build on yourself using |
Re: on the comparisons
Hello,
Allow us, please, to summarize briefly: (0) The measurement uncertainty is error-bounds of the measurement. (1) If a measurement does not involve mathematical expressions then someone can choose the statistical way he likes to mathematically estimate|compute a subjective uncertainty . (2) If a measurement involves known mathematical expressions then either there is or there is not -up to now- a known, unique, mathematical way, that is a way solely based on these mathematical expressions alone, to estimate|compute an objective uncertainty. (3) A vna measurement involves known mathematical expressions and after more than ten 10 years there are now five 5 known mathematical ways to estimate|compute a unique objective uncertainty, each one for each of the five 5 "error" models considered (by intermediately estimate|compute the errors of these "errors"), as well as new one(s), the sixth 6th (or more), shall be added as soon as the "error" model(s) of the NanoVNA will be revealed. (4) These "errors" of "error" models are just historical names of parameters mathematically expressed in terms to what is widely known today collectively as "S-parameters" and thus these are not error bounds - they are not uncertainties of the measurement. Sincerely, yin&pez@arg 6 |
Re: Firmware summary
Dr. David Kirkby from Kirkby Microwave Ltd
n Tue, 24 Sep 2019 at 10:28, <reuterr@...> wrote:
Hello Erik,screen similar to that does display. But it is for such a short period, I can't read it. I guess if I used a phone to video it, I could probably work it out, but it is too quick for my eyes and brain to process. Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 Tel 01621-680100 / +44 1621-680100 |
Re: NanoVNA V2
Dr. David Kirkby from Kirkby Microwave Ltd
On Tue, 24 Sep 2019 at 11:01, <erik@...> wrote:
If you want a really big screen you can easily build on yourself usingVNAs here going up to 20 GHz, building another is not high on my priority list. Perhaps if I was retired, it is something I would do. When I briefly showed the NanoVNA at my radio club, several remarked they could not see the screen as it was too small. I would add, the average aget of the members in my radio club must be late 60's, with the oldest being in their 80's, and the youngest in their 50's, so their eyesight is probably not as good as a youngster. Unfortunately, at least in the UK, there are not that many young hams. But I'm happy with 10% accuracy where others on this group may need 0.01% accuracyI would be happy with somewhere between the two for a portable unit ? I mentioned some places (NPL, METAS) and papers on measurement uncertainty in another post since someone asked about it. -- Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 Tel 01621-680100 / +44 1621-680100 |
Re: NanoVNA V2
Dr. David Kirkby from Kirkby Microwave Ltd
On Tue, 24 Sep 2019 at 09:43, Wolfgang Kiefer <woki@...> wrote:
Hello, Mr. Kirkby,The name of my company, it's company number, where it is registered, and the registered address is required under UK law. I would have thought my messages are shorted than most, as I only quote relevant content, and remove all irrelevant stuff. -- Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 Tel 01621-680100 / +44 1621-680100 |
Re: NanoVNA V2
I saw his schematics and RF simulation files too when it was public repository.
/g/nanovna-users/message/2148 Seems NanoVNA2 dev hiding his works... |
Re: Analyzing Noise versus Leakage on CH1
On Mon, 23 Sep 2019 at 16:55, <erik@...> wrote:
As another way to isolate the source of the 1KHz peaks I ran a test where II opened the nanoVNA and connected the line in of a good USB audio device adjusted the PLL in the tlv320 so it would generate a different sampling rate. It was a one line change to tlv320aic3204.c, line 46: I2CWrite(AIC3204_ADDR, 0x06, 0x08); /* J=8, was 10 */. With the correct value, the frame-rate calculation is: 8.000MHz*10.7520 = 86.016MHz, 86.016MHz/(2*7*128) = 48kHz /48 = 1KHz frame rate With the modified value, the frame-rate calculation is: 8.000MHz*8.7520 = 70.016MHz, 70.016MHz/(2*7*128) = 39.07kHz/ 48 = 814 Hz frame rate With the correct value, the FFT at 1.23GHz is: [image: image.png] With the modified value, the FFT at 1.23GHz is: [image: image.png] The peaks are now approx. 800Hz, which closely tallies with the modified frame-rate. I think this is pretty good evidence that these peaks are related to the frame-rate, not usb or Si5351. The strongest suspect is coupling from the CPU, which does its heavy dsp processing once each frame Rgds, Dave |
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