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Re: Parameter Explanation Please
Bob Albert
Larry, this is basic electric circuit theory.? Any linear bilateral complex impedance can be expressed as an equivalent circuit of two components, a resistance and a reactance.? You can express them either as a series combination or as a parallel combination.? So all the parameters you mention are the results of that calculation.
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A series combination is usually expressed as R + jX, and the R is called series R, or Rs.? And so on.? Read a basic ac circuits textbook to get full explanations. Bob On Thursday, November 14, 2019, 06:45:41 AM PST, Larry Naumann <n0sa@...> wrote:
Okay, I have a NanoVNA ordered and I have a VNWA. I know the differences between X, R and Z. What I do not understand is Xr, Xp, Rr, Rp, Zr, Zp, |Z| etc. I know the r and p mean series and parallel but I do not understand how it functions with single and two port connections. What are the differences, what does it mean as far as connections and readings goes? I need a Dummies Guide to these parameters, explaining differences and connection examples, etc. A reference to a book or webpage would be nice. Thanks Larry n0sa |
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Re: Batteries
18650 cells (especially cheap ones ) rarely have the current capacity they are marked with. I bought 20 cheap 3ah cells from amazon and all of them were closer to 1.5.
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Cheap batteries can be a false economy. Alan On Nov 14, 2019, at 12:45 PM, Nick <g3vnc@...> wrote: |
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Batteries
I am currently repackaging my nvna and would like to include a (much) bigger battery.
What is the biggest battery capacity (Amp-Hours) I could use with the IP5303 charging circuit? Looks to me like there is no limit since the IP5303 will limit the charging current so the initial constant current phase of charging will simply take longer. Why does the 450mAh battery supplied with the device include a built in circuit for over drain protection etc? The IP5303 already has "Input over-voltage, over-current, battery over-charge, over-drain, over-current protection" built in. I'm thinking a fat cell phone Lithium Ion battery should be fine as reported by Larry Rothman here... /g/nanovna-users/photo/0/40?p=Created,,,20,1,40,0 (I was at a flea market a couple of months ago and there was a seller who had a lot of new cylindrical LiIon cells about 3Ah as I recall. They were very cheap, but I did not have a nvna then. I wish now that I had bought a few.) |
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Re: NanoVNA-Saver 0.2.0
Rune,
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Just a note for any Fedora users out there. The right click to save an image does not work under Wayland. I had to switch back to standard gnome. I also had an issue with the fonts in the marker area not using what the rest of the screen was set to. I went back to 1.5 for now. The software is great and I really appreciate all you efforts. On Thu, 2019-11-14 at 14:49 +0100, Rune Broberg via Groups.Io wrote:
Hello Karsten, |
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Re: NanoVNA-Saver 0.2.0
Herb,
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I will certainly consider adding a screenshot feature :-) No promises when it will be in ;-) -- Rune / 5Q5R On Thu, 14 Nov 2019 at 15:16, hwalker <herbwalker2476@...> wrote:
Rune, |
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Re: NanoVNA-Saver 0.2.0
Thank you for these words Herb,
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I have not to much improved SNASharp in last months because I was very busy. But I will get back to it :) David.. -----Message d'origine-----
De : [email protected] [mailto:[email protected]] De la part de hwalker Envoy¨¦ : jeudi 14 novembre 2019 15:58 ? : [email protected] Objet : Re: [nanovna-users] NanoVNA-Saver 0.2.0 On Thu, Nov 14, 2019 at 05:42 AM, David F4HTQ wrote:David, I forgot to acknowledge the fine work you have done on the SNASharp application. I couldn't resist the D6 board at its price point and it probably would have joined a host of other boards in my desk drawer were it not for SNASharp. I plan on making your impedance matching suggestions in the future. The introduction of smt components took a lot of fun out of DIY for the radio amateur. Low cost tech like the NanoVNA and D6 help to restore the balance. - Herb |
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Re: NanoVNA-Saver 0.2.0
On Thu, Nov 14, 2019 at 05:42 AM, David F4HTQ wrote:David, I forgot to acknowledge the fine work you have done on the SNASharp application. I couldn't resist the D6 board at its price point and it probably would have joined a host of other boards in my desk drawer were it not for SNASharp. I plan on making your impedance matching suggestions in the future. The introduction of smt components took a lot of fun out of DIY for the radio amateur. Low cost tech like the NanoVNA and D6 help to restore the balance. - Herb |
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Re: Parameter Explanation Please
Hi Larry,
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Please refer to the forum Wiki. There are a number of application note and reference links there:??? /g/nanovna-users/wiki/External-links Refer to the Smith Chart tutorials. ...Larry On Thursday, November 14, 2019, 9:45:42 a.m. GMT-5, Larry Naumann <n0sa@...> wrote:
Okay, I have a NanoVNA ordered and I have a VNWA. I know the differences between X, R and Z. What I do not understand is Xr, Xp, Rr, Rp, Zr, Zp, |Z| etc. I know the r and p mean series and parallel but I do not understand how it functions with single and two port connections. What are the differences, what does it mean as far as connections and readings goes? I need a Dummies Guide to these parameters, explaining differences and connection examples, etc. A reference to a book or webpage would be nice. Thanks Larry n0sa |
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Re: NanoVNA Firmware and Software Versions and updates
Hi Karsten,
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I assembled all of the available (at that time) firmware that you see in the Files section.? It was done at a time when things were scattered around and forum members were asking where to find a particular version.? Oristo categorized the versions a little better on the Wiki but to date, no one has actually built a table showing the various features of each developer's release.? Of course - now that you've started, I'm sure it would be appreciated by others in the forum if you could create a nicely formatted table either as a PDF (easy export from an Office app) or HTML. Regards, Larry On Thursday, November 14, 2019, 9:17:25 a.m. GMT-5, Karsten, DD1KT <ktholmann@...> wrote:
@all, is there a collection (best would be feature table) besides the Wiki-Page (or one I did not find) where all different Firmwares with the features (my be release dependent) are compared as well as the Application Software releases with its features. As a new member in this group it is very difficult to find out what can be done with which Firmware. What are features of PC/Mac-programs and which combinations work. My proposal would be to use this Topic to collect all versions as well as updates. The Wiki has already a collection, but I am not sure, if every Firmware and software programmer is adding his newest version to the Wiki page (if possible) As Firmware:? -H? -Q, -F , edy555 (for different display calibration), Eric, DMR, Xenomorph As Application :? NanoVNASaver,? NanoVNA-Web-client, TAPR, NanoVNASharp With ASCII it is difficult do do a table. I hope they keep readable : ----------------------Firmwares---------------------: FW/funktion? SreenCopy maxFreq? 4/2traces? CW-SWR? NanoVNASaver, Vbat_state NanoVNA-Web-client, TAPR, NanoVNASharp comment -H? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? 1.5G? ? ? 4/ 2b.font? ? ? ? big? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? y? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? -Q? ? ? ? ? ? ? ? ? ? ? ? ? ? y? ? ? ? ? ? 1.5G? ? ? ? ? ? ? 4? ? ? ? ? ? ? ?? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? y? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? y? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? -F? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ?? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? edy555? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? 1.5G? ? ? ? ? ? ? 4? ? ? ? ? ? ?? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? y? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? screen cal needed for -h Hardware? ? ? Eric? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ?? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? y? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? DMR? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ?? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? y? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ?? ? ? ? ? ? ----------------------Software---------------------: SW/function? ? ? ? ? ? ? ? ? Windows? MAC Android? TDR? morePoints ScreenCopy NanoVNASaver? ? ? ? ? ? ? ? ?,7,10? ? y? ? ? ? ?? ? ? ? ? y? ? ? ? ? y? ? ? ? ? ? ? ? ? NanoVNA-Web-client? ? ? ? ?,7,10? ? ?? ? ? ? y? ? ? ? ? ?? ? ? ? ? ?? ? ? ? ? ? ? ? ? TAPR? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?,7,10? ? ?? ? ? ? ?? ? ? ? ? ?? ? ? ? ? ?? ? ? ? ? ? ? ? ? NanoVNASharp? ? ? ? ? ? ? ? ?,7,10? ? ?? ? ? ? ?? ? ? ? ? ?? ? ? ? ? ?? ? ? ? ? ? ? ? y It should be possible to be update the tables with a copy vy73 de Karsten, DD1KT |
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Parameter Explanation Please
Larry Naumann
Okay, I have a NanoVNA ordered and I have a VNWA.
I know the differences between X, R and Z. What I do not understand is Xr, Xp, Rr, Rp, Zr, Zp, |Z| etc. I know the r and p mean series and parallel but I do not understand how it functions with single and two port connections. What are the differences, what does it mean as far as connections and readings goes? I need a Dummies Guide to these parameters, explaining differences and connection examples, etc. A reference to a book or webpage would be nice. Thanks Larry n0sa |
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Re: NanoVNA-Saver 0.2.0
Rune,
Seems at least a few members are requesting the capability of taking and saving a screenshot be added to NanoVNA-Saver. The python code is included in edy555's nanovna.py script. From my experience, the primary "got you" is the NanoVNA needs to be reset when taking screenshots of the version screen or a screen including the on-screen keyboard. You might pow-pow with QRP regarding the latter two problems as he seems to have figured it out in NanoVNA Sharp V3. Not sure if he solved it by firmware modification or in code. - Herb |
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NanoVNA Firmware and Software Versions and updates
@all,
is there a collection (best would be feature table) besides the Wiki-Page (or one I did not find) where all different Firmwares with the features (my be release dependent) are compared as well as the Application Software releases with its features. As a new member in this group it is very difficult to find out what can be done with which Firmware. What are features of PC/Mac-programs and which combinations work. My proposal would be to use this Topic to collect all versions as well as updates. The Wiki has already a collection, but I am not sure, if every Firmware and software programmer is adding his newest version to the Wiki page (if possible) As Firmware: -H -Q, -F , edy555 (for different display calibration), Eric, DMR, Xenomorph As Application : NanoVNASaver, NanoVNA-Web-client, TAPR, NanoVNASharp With ASCII it is difficult do do a table. I hope they keep readable : ----------------------Firmwares---------------------: FW/funktion SreenCopy maxFreq 4/2traces CW-SWR NanoVNASaver, Vbat_state NanoVNA-Web-client, TAPR, NanoVNASharp comment -H ? 1.5G 4/ 2b.font big ? y ? ? ? -Q y 1.5G 4 ? ? y ? ? y -F ? ? ? ? ? ? ? ? ? edy555 ? 1.5G 4 ? ? y ? ? ? screen cal needed for -h Hardware Eric ? ? ? ? ? ? ? y ? DMR ? ? ? ? ? y ? ? ? ----------------------Software---------------------: SW/function Windows MAC Android TDR morePoints ScreenCopy NanoVNASaver ?,7,10 y ? y y ? NanoVNA-Web-client ?,7,10 ? y ? ? ? TAPR ?,7,10 ? ? ? ? ? NanoVNASharp ?,7,10 ? ? ? ? y It should be possible to be update the tables with a copy vy73 de Karsten, DD1KT |
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Re: NanoVNA-Saver 0.2.0
On Thu, Nov 14, 2019 at 05:42 AM, David F4HTQ wrote:
" ¡ The limitation of 100Hz comes from the firmware, and maybe even hardware ¡." ----------------------------------------------------------------------------- David, The hardware is capable of 1Hz steps the limitation is - or was- in the firmware. QRP's 0.4.3 firmware restores 1 Hz steps and add other enhancements such as extending the frequency range from 10 kHz - 1500 MHz and calibrating the battery display (not a full list of enhancements). - Herb |
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Re: NanoVNA-Saver 0.2.0
Hello Karsten,
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The software takes readings from the NanoVNA, and displays them and does calculations on them. The readings taken are the S-parameters, S11 and S21, so any settings for traces on the device are ignored. NanoVNA-Saver does its own calculations of derived values, including TDR. It allows reading more than 101 points by stitching together multiple "segments" of the total span of interest. Calibration is available on the PC-side in NanoVNA-Saver, which allows you to get a calibration with more points than on the device itself, as well as the ability to use custom calibration standard sets. The application does not (currently) support taking screenshots of the NanoVNA - there are excellent scripts that do this out there - but you can save images of any of the graphs via the right click menu. Frequency generation is still fundamentally part of the firmware - NanoVNA-Saver tells the firmware the start and stop frequency of the "segment" it is currently reading, and gets back a list of the actual frequencies read, and the values at those frequencies. To get a step size lower than 100Hz, you would need a firmware that supports steps of that size. The software does not need a specific firmware, but newer firmwares have bugfixes, and I recommend using a new firmware to get the best experience with your device in general. I hope I've answered your questions, otherwise, don't hesitate to ask here on the list :-) -- Rune / 5Q5R On Thu, 14 Nov 2019 at 14:23, Karsten, DD1KT <ktholmann@...> wrote:
Hello Rune, |
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Re: NanoVNA-Saver 0.2.0
Hi Jean,
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thank you very much! It's exciting to hear what uses people find for my little hobby software project! -- Rune / 5Q5R On Thu, 14 Nov 2019 at 14:09, <ptapon@...> wrote:
Hi Rune, |
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Re: NanoVNA-Saver 0.2.0
Hi Lucio,
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NanoVNA-Saver reads the current frequency span of the NanoVNA, and uses that as the default. It does not read any other configuration values from the NanoVNA, yet anyway. Thank you for the praise :-) I'm glad you enjoy using it. I hope this is helpful, -- Rune / 5Q5R On Thu, 14 Nov 2019 at 10:22, Lucio I?LYL <lucio.i0lyl@...> wrote:
@Rune Broberg |
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Re: NanoVNA-Saver 0.2.0
Hi Herb,
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I'm glad you're enjoying that second marker :-) I don't know what the group delay graph is trying to tell you .. I just write the code ;-) -- Rune / 5Q5R On Thu, 14 Nov 2019 at 02:40, hwalker <herbwalker2476@...> wrote:
Rune, |
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Re: NanoVNA-Saver 0.2.0
Hi Karsten,
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I answer partially instead Rune's. The limitation of 100Hz comes from the firmware, and maybe even hardware. Another solution to determine the motionals parameters of a crystal is to use SNASharp with a compatible scalar analyzer. Look here: SNASharp official page (in french sorry): David, F4HTQ. -----Message d'origine-----
De : [email protected] [mailto:[email protected]] De la part de Karsten, DD1KT Envoy¨¦ : jeudi 14 novembre 2019 14:24 ? : [email protected] Objet : Re: [nanovna-users] NanoVNA-Saver 0.2.0 Hello Rune, I am quite new to the group and am already scanning all the messages for information. So please excuse, if I missed the information I am now askig for: Which functions are taken over from your Software NanoVNA-Saver and which functions are still based on the Firmware. e.g. I understand, you have your own calibration values for the correction of the traces, you do not use the values stored in the Firmware my concrete questions: - if I need small steps to measure a crystal filter (I read that the original old (September) Firmware has 100 Hz steps), can I do it with your software, or is the frequency generation taken from the firmware? - to take a screen-shot, would I need an other Firmware and other PC-Programm, or is it also possible with your Software? - Is there the need or proposal to use a specific Firmware to get all possibilities of your Software? vy73 de Karsten, DD1KT |
Alan Zimmerman
Oristo
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