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Re: NanoVNA for CB radio tuning
I mean, you could run it in-line, like an SWR meter... but you probably
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won't find it very useful soon after that. ^.^ Just to chime in for Chris' comment about Smith Charts... I found this video by Alan Wolke (W2AEW) great. (I find most of his stuff super informative, and helpful). ~Josh W0ODJ On Thu, Mar 19, 2020 at 11:44 AM Birdman <ccarrara@...> wrote:
Tuning the “CB” antenna will be EXACTLY like any other antenna, just |
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Re: Analysing Input Impedance Matching Circuit for the NE602
Maybe I did not understand it correctly, but it appears to me that youI have made a set of cables using RG316 with SMA connectors at one end and short wires at the other. I also made a set of open, short, load and through connectors that the wires attach to so I can calibrate the VNA right to the end of the wires. I know this is not going to work well at high frequencies but for around 10MHz it does seem to work and I have seen a few videos where others have done similar things which gave me the idea to try this. I think this is similar to your suggested method except I have attached an extra bit of cable and am using my own SOLT connectors rather than the ones which come with the NanoVNA as I can calibrate right at the very ends of the wire. In reply 11814 I can see the return loss on my cables is around -33dB when CH0 is connected to CH1 at 7MHz and using the supplied cables and through connector (reply 11835) it is around -43dB. |
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Android app and needed USB OTG cables and adapters (must have!)
As far as I can tell, every android device would need an OTG adapter or OTG cable to work with the NanoVNA. That way, the android sees the vna as an active device and not just as a passive storage device.
I got my nanovna in October or November, 2019. For Black Friday I bought a Samsung Galaxy Tab A 10.1 and wanted to connect it to the nanovna. I had already gotten OTG adapter cables for other uses, and have connected a USB mouse and USB keyboard to an older tablet and even to a phone. Because I've seen postings by people who have had trouble connecting their android to the nanovna, I thought I might be able to provide some helpful information. So, here we go. For use with the new tablet, I bought this package from Amazon: CHENYANG Ultra Mini DM Micro USB 5pin OTG Adapter Connector for Cell Phone Tablet & USB Cable & Flash Disk - 5pcs They are roughly the size of a fingernail and connect to the nanvna end of the usb cable. Both ends of the adapter fit Micro USB connectors, so another cable may be added to connect to the USB-C connector on the nanovna. In July 2018, I had purchased this adapter = Rankie Micro USB (Male) to USB 2.0 (Female) Adapter, On-The-Go (OTG) Convertor Cable, 3-Pack (Black) which may be another possibility, depending on your stock of USB cables on hand. Pasting my old urls/descriptions from my Amazon Orders page don't seem to show up as links, but the text descriptions should enable a person to find a suitable adapter. Most seem to come in packages of several. Adapter cables came 2 or 3 to a pack, and the tiny adapters were 5 of them for a little over $4 - with free shipping! If you're in a big enough city, with big, well-stocked computer stores, you might be able to find a local source for a cable or adapter. But it might be a long search! I'm sure they would also be on ebay, but Amazon is more convenient for me, plus it has the reviews which I generally find are very useful. So - I hope this might help new NanoVNA users who want to connect their vna to an android device. It sure can help when you're outdoors in bright daylight! Doug, K8RFT |
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Re: ON7DQ_NanoVNA_Presentation_English
Hi Jean-Roger,
Thanks for finding another typo. I'll correct the slide soon. I had first taken a 9 MHz step (full range of 900 MHz, divided by 101 points, is roughly 9 MHz) But this gave only 22m maximum length (or 11m if you divide by 2), so I changed the step to 1 MHz, but forgot to change the 9, hi. Now as for the lenght, divide by 2 or not, I'm not sure ... I got the info from this site (and I believe also Rune got the Python code there for nanoVNA Saver) I seems the FFT routine calculates the time to the open end from the S11 values, so that would be "one way", and so also the "maximum length" in that article would be the distance to the fault (open). My "feeling" says that indeed we should divide it by two (I'm also from the "old school" TDR measurement ... with an impulse sent , and seen on a scope ...) I'm not a mathematician at all , so maybe someone else can clarify what is the correct answer ? 73, Luc ON7DQ |
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Re: V2 Design
#nanovna-v2
Looks like mine is moving to the next step forward after being stuck for 5 days at the Shanghai International Mail Exchange Station
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2020-03-19 10:05 Shanghai, delivered to air transport Hope to get it soon! Reinier Op 19-3-2020 om 21:50 schreef Neal Pollack: Yes, same here. Stuck at airport. That's why I posted. |
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Re: V2 Design
#nanovna-v2
Yes, same here. Stuck at airport. That's why I posted.
It points to the fact that no flights are being permitted between USA and China. For previous orders from China, it usually is only at the airport for a day or two, then shows landed in destination country. Oh well. Maybe we will get them in late summer... Neal |
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Re: Analysing Input Impedance Matching Circuit for the NE602
Maybe I did not understand it correctly, but it appears to me that you are using cables with open ends to connect to the transformers. If this is the situation, how do you calibrate the nanoVNA?.
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if you have calibrated it with the SOL directly at the instrument ports, you are measuring the combined response of the transformer plus the cables and it lead to errors. If this is the situation, I would solder female SMA connectors to the transformer leads, calibrate the instrument using the test cables, and then connect these cables to the input and output of the transformers. Doing that you insure that the cables are included in the calibration and your measurements are done at the transformer connectors. Regards, Ignacio, EB4APL El 19/03/2020 a las 15:36, Kerr Smith escribió:
Thank you very much for your suggestions - I really appreciate them and have learnt a lot from reading about the various ideas people have offered and from doing my experiments. --
El software de antivirus Avast ha analizado este correo electrónico en busca de virus. |
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Re: Battery for nanoVNA
Gianni,
The 2.8" NanoVNA usually is delivered with a 400-450 mAh LiON battery which yields about 2 - 3 hours of portable operation. If you have an unused cell phone you can take the battery out of it. The battery input for some NanoVNA's is connectorized, on others it is soldered. The newer NanoVNA-H v3.4 even has a 650 mAH battery so you can go bigger if you want for longer portable operation. - Herb |
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Re: V2 Design
#nanovna-v2
WOW , Your shipping looks just like mine
esp where it gets stuck in Shanghai, Airline Carrier 2020-03-12 22:15 The only difference is mine is stuck on the 13th of March And shipping is DHL, I wish I had better news but at least it is on its way Nels On Wed, Mar 18, 2020 at 11:46 PM David Feldman via Groups.Io <wb0gaz= [email protected]> wrote: Your ship confirmation from Tindie should have included a tracking number-- n_n |
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Re: New to Group & 【Upgraded】AURSINC Vector Network Analyzer
Youtube has lots of training videos?
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Sent from Yahoo Mail for iPad On Thursday, March 19, 2020, 1:13 PM, David Shrum <dave.n8pu@...> wrote:
Thanks Herb, I can see for me for now there will be a steep learning curve, right now I would rather throw it out the window, but just like everything else you start at the bottom and start trying to figure new things out. It has been a loooooooong time since high school, almost 53 years since I got out. I made myself a local copy so if / when my brain says it needs a break I can easily come back to it. Thanks again, Dave On Thu, Mar 19, 2020 at 1:46 PM hwalker <herbwalker2476@...> wrote: On Thu, Mar 19, 2020 at 09:57 AM, David Shrum wrote: |
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Re: New to Group & 【Upgraded】AURSINC Vector Network Analyzer
David Shrum
Thanks Herb, I can see for me for now there will be a steep learning curve,
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right now I would rather throw it out the window, but just like everything else you start at the bottom and start trying to figure new things out. It has been a loooooooong time since high school, almost 53 years since I got out. I made myself a local copy so if / when my brain says it needs a break I can easily come back to it. Thanks again, Dave On Thu, Mar 19, 2020 at 1:46 PM hwalker <herbwalker2476@...> wrote:
On Thu, Mar 19, 2020 at 09:57 AM, David Shrum wrote: |
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Re: New to Group & 【Upgraded】AURSINC Vector Network Analyzer
On Thu, Mar 19, 2020 at 09:57 AM, David Shrum wrote:
... for now the only thing I'm interested in is the SWR of the antenna I'm checking. .. ======================================================== David, A lot of ham's only want to use the NanoVNA the same way they use a MJF analyzer and don't care about the other functions, at least initially. The following Web translator link by a Japanese ham does a good job of going through the steps of getting rid of unnecessary display traces and setting up CH0 to use the NanoVNA as an antenna analyzer. or try: and use Microsoft or Google Translate. - Herb |
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Re: H4 large display size: Fonts??
On Thu, Mar 19, 2020 at 09:50 AM, Birdman wrote:
Can somebody with the new H4 units tell me if the fonts are BIGGER than the small display? OR, is the font the same size, you just get more stuff on the bigger display? ============================================================= Chris, The fonts are bigger than on the regular firmware version of the small display, but about the same size as the -AA firmware version of the small display. Load the -AA firmware on your NanoVNA and it will give you an idea of the the NanoVNA-H4 or NanoVNA-F font-size. The -AA firmware also makes the small NanoVNA easier to use if you wear glasses. - Herb |
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Re: New to Group & 【Upgraded】AURSINC Vector Network Analyzer
John Galway
Get NanoVNA-Saver and use your PC and you will have an easier time viewing the SWR chart only.
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John GalwayKH6JTE On Thursday, March 19, 2020, 11:57:33 AM CDT, David Shrum <dave.n8pu@...> wrote:
First thanks to the moderators for adding me. As the title of my message says, I'm new also to the AURSINC Vector Network Analyzer (bought on Amazon). I have watched a couple of YouTube videos about this device, which was delivered to me March 18, 2020. Also I have never used something like this, I think I have calibrated it to the desired area (frequency range) I want to use, but really for now the only thing I'm interested in is the SWR of the antenna I'm checking. I have a MFJ - 269 (the original one) antenna analyzer which I like, but it would be nice to be able to use this because of it's size. Maybe later I'll figure out the different charts it has and how to use them, but for now I just want to ONLY see the SWR. I have clicked on the SWR button but there is still all the other info on the screen that I don't want to see. I'm not sure which PDF manual I should download (this is what I downloaded, NanoVNA User Guide_20190711.pdf) to hopefully figure this out, but for now, if there was / is such a thing as a manual for dummies, that might help. I apologize for asking the same question I'm sure has been ask to ad nauseam but you got to start from somewhere. And thanks for being patient with me. Dave N8PU |
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New to Group & 【Upgraded】AURSINC Vector Network Analyzer
David Shrum
First thanks to the moderators for adding me. As the title of my message says, I'm new also to the AURSINC Vector Network Analyzer (bought on Amazon). I have watched a couple of YouTube videos about this device, which was delivered to me March 18, 2020. Also I have never used something like this, I think I have calibrated it to the desired area (frequency range) I want to use, but really for now the only thing I'm interested in is the SWR of the antenna I'm checking.
I have a MFJ - 269 (the original one) antenna analyzer which I like, but it would be nice to be able to use this because of it's size. Maybe later I'll figure out the different charts it has and how to use them, but for now I just want to ONLY see the SWR. I have clicked on the SWR button but there is still all the other info on the screen that I don't want to see. I'm not sure which PDF manual I should download (this is what I downloaded, NanoVNA User Guide_20190711.pdf) to hopefully figure this out, but for now, if there was / is such a thing as a manual for dummies, that might help. I apologize for asking the same question I'm sure has been ask to ad nauseam but you got to start from somewhere. And thanks for being patient with me. Dave N8PU |
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H4 large display size: Fonts??
I know this has been asked before, but I can’t seem to find a proper answer to the question. Can somebody with the new H4 units tell me if the fonts are BIGGER than the small display? OR, is the font the same size, you just get more stuff on the bigger display?
I have a heck of a time, even with my reading glasses on, reading these little itty bitty fonts! Thanks in advance. PS- yes, I know there is a “large font” version of the firmware, but I like to keep the standard firmware.... -- Regards, Chris |
Neal AB6G
Chris K2STP
Dallas N4DDM
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