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Re: USB cable
Bob Albert
Larry, I don't see how to attach the ST-link but for $2 it might be a solution.? Can you provide more info?
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As for Aliexpress I have been having serious trouble with them.? The latest involves a mistake on the seller's part and my package was sent to the wrong place.? They are asking me to wait two months for resolution.? Not acceptable so I am going to avoid using them for future needs. Bob On Friday, December 6, 2019, 10:20:16 AM PST, aparent1/kb1gmx <kb1gmx@...> wrote:
As yet I've had no issue with the current USB connector used... but its small and fragile.? On another piece of gear I've had issues with the mini and micro USB connectors and finally removed it with care and replaced it using a USB-B connector which while larger is robust and the interconnect wires were short #30 wire wrap wires. It is my plan for this unit once I make a suitable case to make that change proactively.? USB being a 4 wire plus ground its a trivial change other than small (something I am used to).? I tend to make mods based on making it more robust in use. ----------------- I do not accept private email due to forum scraping groups.io |
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Re: USB cable
aparent1/kb1gmx
As yet I've had no issue with the current USB connector used... but its
small and fragile. On another piece of gear I've had issues with the mini and micro USB connectors and finally removed it with care and replaced it using a USB-B connector which while larger is robust and the interconnect wires were short #30 wire wrap wires. It is my plan for this unit once I make a suitable case to make that change proactively. USB being a 4 wire plus ground its a trivial change other than small (something I am used to). I tend to make mods based on making it more robust in use. ----------------- I do not accept private email due to forum scraping groups.io |
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Re: USB cable
Fixed the url
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On Friday, December 6, 2019, 1:06:09 p.m. GMT-5, Larry Rothman <nlroth@...> wrote:
Bob, Buy an ST-LINK adapter for a few bucks from this place where I got mine and you can read and write to the micro using the edge pins. Works great. ...Larry ? ? On Friday, December 6, 2019, 12:56:30 p.m. GMT-5, Bob Albert via Groups.Io <bob91343@...> wrote: ? I like the idea of soldering a cable to the board.? When my mind is sufficiently clear I will take a look and see if I can identify the appropriate places on the board. I am not optimistic because the connector I removed had many pins, and I don't have a proper guide to where to make connections.? Further, when I tried at one point to apply 5V here or there I got no results. What I have now works well and I am loath to repair it.? It's basically a cable coming from the nano and has a USB plug on the end.? The main things that could be improved would be to add the data lines and to have a socket on the nano.? The latter isn't going to happen.? So basically I just want to know where to connect the other two wires so I can transfer data. It's not clear on the board, what goes where and I would be unhappy if I messed it up worse than it is. If I need to transfer data I have the fully working unit I can use.? Most of the time I am content with local operation so it's not that important.? I get very accurate readings and don't want to monkey with the bit of success I have. ? ? On Friday, December 6, 2019, 02:51:17 AM PST, Larry Rothman <nlroth@...> wrote: No problem. We all get ahead when we 'play' with our 'toys'? ;-) ? On Fri, 6 Dec 2019 at 5:44 AM, Gyula Molnar<gyula.ha3hz@...> wrote:? Hi Larry, I'm glad that many people have noticed what the original author wrote in the "Know issues" section of the NanoVNA alpha1 kit assembly manual. I think the same way, thank you for trying to confirm that I'm not trying in vain. 73, Gyula On Fri, Dec? 6, 2019 at 12:14 AM, Larry Rothman wrote:
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Re: USB cable
Bob,
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Buy an ST-LINK adapter for a few bucks from this place where I got mine and you can read and write to the micro using the edge pins. Works great. ...Larry On Friday, December 6, 2019, 12:56:30 p.m. GMT-5, Bob Albert via Groups.Io <bob91343@...> wrote:
I like the idea of soldering a cable to the board.? When my mind is sufficiently clear I will take a look and see if I can identify the appropriate places on the board. I am not optimistic because the connector I removed had many pins, and I don't have a proper guide to where to make connections.? Further, when I tried at one point to apply 5V here or there I got no results. What I have now works well and I am loath to repair it.? It's basically a cable coming from the nano and has a USB plug on the end.? The main things that could be improved would be to add the data lines and to have a socket on the nano.? The latter isn't going to happen.? So basically I just want to know where to connect the other two wires so I can transfer data. It's not clear on the board, what goes where and I would be unhappy if I messed it up worse than it is. If I need to transfer data I have the fully working unit I can use.? Most of the time I am content with local operation so it's not that important.? I get very accurate readings and don't want to monkey with the bit of success I have. ? ? On Friday, December 6, 2019, 02:51:17 AM PST, Larry Rothman <nlroth@...> wrote: No problem. We all get ahead when we 'play' with our 'toys'? ;-) ? On Fri, 6 Dec 2019 at 5:44 AM, Gyula Molnar<gyula.ha3hz@...> wrote:? Hi Larry, I'm glad that many people have noticed what the original author wrote in the "Know issues" section of the NanoVNA alpha1 kit assembly manual. I think the same way, thank you for trying to confirm that I'm not trying in vain. 73, Gyula On Fri, Dec? 6, 2019 at 12:14 AM, Larry Rothman wrote:
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Re: USB cable
Bob Albert
I like the idea of soldering a cable to the board.? When my mind is sufficiently clear I will take a look and see if I can identify the appropriate places on the board.
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I am not optimistic because the connector I removed had many pins, and I don't have a proper guide to where to make connections.? Further, when I tried at one point to apply 5V here or there I got no results. What I have now works well and I am loath to repair it.? It's basically a cable coming from the nano and has a USB plug on the end.? The main things that could be improved would be to add the data lines and to have a socket on the nano.? The latter isn't going to happen.? So basically I just want to know where to connect the other two wires so I can transfer data. It's not clear on the board, what goes where and I would be unhappy if I messed it up worse than it is. If I need to transfer data I have the fully working unit I can use.? Most of the time I am content with local operation so it's not that important.? I get very accurate readings and don't want to monkey with the bit of success I have. On Friday, December 6, 2019, 02:51:17 AM PST, Larry Rothman <nlroth@...> wrote:
No problem. We all get ahead when we 'play' with our 'toys'? ;-) ? On Fri, 6 Dec 2019 at 5:44 AM, Gyula Molnar<gyula.ha3hz@...> wrote:? Hi Larry, I'm glad that many people have noticed what the original author wrote in the "Know issues" section of the NanoVNA alpha1 kit assembly manual. I think the same way, thank you for trying to confirm that I'm not trying in vain. 73, Gyula On Fri, Dec? 6, 2019 at 12:14 AM, Larry Rothman wrote:
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Re: New version of NanoVNA-Saver: 0.2.1
Thank you Erik for quick answer.
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Actually I wanted at first to know the antenna impedance, but having also info about the feeder seems very interesting. Thank you also Rune for the very useful software NanoVNA-saver, it's a full job hobby just to play with all the features. On Fri, Dec 6, 2019 at 6:38 PM <erik@...> wrote:
I'm not an expert but this is what I understood: |
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Re: New version of NanoVNA-Saver: 0.2.1
I'm not an expert but this is what I understood:
Zplot is able to determine the impedance of the feed cable (if different from pure 50ohm) It also is able to calculate the frequency dependent loss This will help you understand what power goes into the cable and what into the antenna. When you calibrate at the end of the feedline you ignore the cable. When ignoring the cable (apart from the compensated delay) is ok, calibration at the end of the feedline is ok -- NanoVNA Wiki: /g/nanovna-users/wiki/home NanoVNA Files: /g/nanovna-users/files Erik, PD0EK |
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Re: New version of NanoVNA-Saver: 0.2.1
Dear Erik,
regarding your method: "Using nanoVNA saver you can measure your antenna feedline with the antenna disconnected and replaced with a OPEN/SHORT The resulting two touchstone files can be imported into ZPlot and ZPlot will calculate a full transmission line model (k0,k1,k2) for your antenna feed cable including the delay. Then you measure your antenna connected to the feedline and import in ZPlot using the calculated transmission line model and have all the details of your antenna without the impact of the cable or you use the calculated delay in nanoVNA saver to quickly eliminate the biggest impact of the feedline " If I calibrate the feedline with O, S,L and then connect the antenna and measure it with NanoVNA, what would be the difference comparing to your suggested method? TNX, 73 Ady YO2NAA |
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Re: New version of NanoVNA-Saver: 0.2.1
Dear pgc1682
The nanoVNA is a wonderful example of how to do the best with the least at a price point everyone can afford. Has this lead to compromise? Yes. example is the size of the screen or the max 101 points. Many complain, but still like the low price. How about the harmonics? As long as you measure non frequency translating devices the harmonics don't care, they are actually exploited in a very clever way. How about the quality? Can you compare to a professional VNA 100 times more expensive? No, but it is still extremely useful. Can you overcome many of the limitations. Yes, people (like Rune) are creating excellent PC SW to augment the nanoVNA functionality (like more points, better calibration, more measurements) Problem with this SW is that it has to strike a balance between what is possible versus what makes sense. Should the SW try to copy what the high end VNA's do or focus on the broadest possible user base in a way that it is easy to understand. All difficult choices and we use the group to exchange views and collaborate. Often new people (like you) appear on the forum that are puzzled about what the nanoVNA can/should/cannot do. Posting questions will likely get answers and we also accept people can get a bit frustrated. Never assume people are doing stupid things, they may just be different from what you would do and that is OK. -- NanoVNA Wiki: /g/nanovna-users/wiki/home NanoVNA Files: /g/nanovna-users/files Erik, PD0EK |
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File updated in [email protected]
[email protected] Notification
Hello, This email message is a notification to let you know that the following files have been updated in the Files area of the [email protected] group. Uploaded By: Larry Rothman <nlroth@...> Description: Cheers, |
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Re: nanovna-saver-v0.2.1 Stops Working
Paul,
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It sounds as if you did not calibrate the Nano correctly and the PC app is getting corrupted data. Please follow the various calibration instructions either on the forum Wiki or in the User Guide (Files section) and try again. Thanks,Larry On Friday, December 6, 2019, 9:30:28 a.m. GMT-5, paul larner <quadzillatech@...> wrote:
I get a similar problem,for the first few mins the screen jitters all over the place,then settles down but i have no cursor on the polar or smith chart,its pretty much unusable as it is for me. |
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Re: nanovna-saver-v0.2.1 Stops Working
Rune, thanks for the reply, much appreciated.
I download the '64' version of VC++ 2015 first and that didn't work...8^) Then did the same for the '86; version and Eureka!.. There it is, a window full with a nice large Smith Chart. Now to figure out how to use it when my Nanovna-H arrives around the end of December. I'll be doing some reading in the mean time. Thanks for the assist. -- Chuck, W5USJ |
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Re: New version of NanoVNA-Saver: 0.2.1
Hi Kurt and others,
Sorry for wrong copied new post. I deleted it. Now the the correct reply: Thanks for the detailed reply. You can send to me the measurements in file s1p format? You can measure this with professional grade VNA and export s1p format? I frequently use zplots and sim smith chart ( ). Both program useful function extensions for vna-s. Many amateur grade instrument not have useful functions (Markers, cursors, graphs, etc.). I like nanovna-saver, many function available without external program. Some amateur grade commercials vna says: Laboratory grade. This is not true, i test the R&S entry level (!) handheld vna, much better. Of course, many bad connector, adapters, cables exist. For example, my unkown (i think, Hugen, but not 100%) clone nanovna sma thru adapter very bad. Very lossy and not 50 ohm. I have another sma thru, much better. Near ideal with nanovna. Professional adapters and calibration kit have low loss. I see many cheap adapter lossy. I think, this erros maybe compensatable. But easiest way change to good adapter. I use lossy port extension trick on low frequncy (if osl calibration impossible), 1,8Mhz to 52 mhz. I not understand square wave signal how many bad. I think not good. Harmonics, for example. Another questions, the calibrations. Nanova-saver see raw input values? Or selectable? I think not, use only 101 point nanovna calibration. This is bad for expert user, double calibrations. And 101*10 = 1010 point data, interpolate between 101 original calibration points not a best way. I think some ripple from this way, but i will test it. Professional instrument not recommended to use interpolated calibration point. If change frequency range, it works, but displayed the "uncalibrated" warning. On nanovna, i can not find correct calibration. For example open short load delays not user definable. I have not zero lenght N osl calibration kit. Not all sma short has zero delay. I think requres firmware mod. |
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Re: 1500Mhz, usable ?
On 04/12/2019 14:22, matyslubin@... wrote:
Barry, looks like you are from UK.My unit came from an eBay supplier in Basildon Essex, however the listing is no longer there. I would suggest the nanovna-h which comes with case and all accessories including a USB-C to USB-C lead for use with phones that have USB-C. This version includes resistors to allow the use of this cable. Search ebay for nanovna-h and look for the supplier in Basildon. I think it will come with the 1500MHz firmware (a friend of mine bought one recently and it did). If not it is simple to upgrade it. For best results be sure to calibrate it over a fairly small range, say 1050 to 1150MHz before using it at 1090, or the 101 calibration points will be too widely spaced. Nanovna-saver: Save the calibration to a memory and also to memory 0 before using nanovna-saver. You can then re-calibrate in the software over maybe 1000 points within the span of use, to get even higher resolution. Have fun, hope it works out. Barry |
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Re: NanoVNA-Web-Client, problem with Chromebook
GM4CID
Gwen,
Thank you for this interesting solution, think I will leave this Chromebook stock (Version 76.0.3809.136 (Official Build) (64-bit) as there are several laptops and desktops also in us here, the Chromebook tends to be used for casual browsing and email. 73, Bob GM4CID |
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Re: nanovna-saver-v0.2.1 Stops Working
Have you had any other versions of NanoVNA-Saver running previously?
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Do you know if you have a new-ish version of the Microsoft VC++ Redistributable library installed? (I think it should be included with SP1, but I'm not certain) -- Rune / 5Q5R On Fri, 6 Dec 2019 at 11:39, Chuck Carpenter <w5usj@...> wrote:
Downloaded the file and moved it to a different folder. |
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Re: USB cable
No problem.
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We all get ahead when we 'play' with our 'toys'? ;-) On Fri, 6 Dec 2019 at 5:44 AM, Gyula Molnar<gyula.ha3hz@...> wrote: Hi Larry, I'm glad that many people have noticed what the original author wrote in the "Know issues" section of the NanoVNA alpha1 kit assembly manual. I think the same way, thank you for trying to confirm that I'm not trying in vain. 73, Gyula On Fri, Dec? 6, 2019 at 12:14 AM, Larry Rothman wrote:
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Chuck Carpenter
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