Nano VNA like sand on the sea- Who is the "good one" ? - Page 1
Forum section: electronics / testgear

author: Martin72
author_rank: Super Contributor
timestamp: July 09, 2024, 09:17:07 pm
content: Hi folks,Quick question:I just want to play around with a VNA and a cheap Nano VNA seems to be the perfect solution.However, if you search for it, there are countless variants.Which one is the "good" one, which one should I get?Thanks in advance.Martin

author: Aldo22
author_rank: Super Contributor
timestamp: July 09, 2024, 10:24:32 pm
content: There are different screen sizes and bandwidths etc.I don't know if there is the one "good one".I have one of the cheapest (as always) from the "SeeSii Factory Store Store" which seems trustworthy/recommended: a NanoVNA-H.It has an SD card slot, the inputs are shielded, you can update the firmware from theusual sourcesand I got a pretty big battery (1300mAh), but don't know if that's standard.It's good enough for me.More expensive ones are probably better if you have a use for them.

author: tszaboo
author_rank: Super Contributor
timestamp: July 09, 2024, 10:31:16 pm
content: For the Nano, the H4 is recommended by a lot of people. I just bought a LiteVNA, which is a bit faster than the Nanos.What is even more important is to buy it from reputable sources. Because there are a lot of interior clones out there. They might be missing the shielding. Or the PCB is not impedance controlled. Or the cal kit which comes with it is trash.

author: Geoff-AU
author_rank: Frequent Contributor
timestamp: July 10, 2024, 12:36:26 am
content: Quote from: tszaboo on July 09, 2024, 10:31:16 pmThis is the most important factor. Buy a genuine one.

author: joeqsmith
author_rank: Super Contributor
timestamp: July 10, 2024, 01:26:17 am
content: Quote from: Martin72 on July 09, 2024, 09:17:07 pmAs you said, they are cheap, and if you just want to play, I don't think it really matters too much. Later as you refine your requirements, you can always buy something that better fits.I continue to use the LiteVNA64 for some experiments. We purchased ours from:https://www2.randl.com/index.php?main_page=product_info&products_id=75669

author: BrokenYugo
author_rank: Super Contributor
timestamp: July 10, 2024, 01:37:57 am
content: nanovna.com suggests a specific Aliexpress store.https://nanovna.com/?page_id=121https://zeenko.aliexpress.com/store/1101394653

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 10, 2024, 01:45:32 am
content: Quote from: BrokenYugo on July 10, 2024, 01:37:57 amThat actually makes sense. That's also the official store for the TinySA.

author: ch_scr
author_rank: Frequent Contributor
timestamp: July 10, 2024, 06:22:38 am
content: For Europe/Germany, buying the LiteVNA fromEleshopseems like a reasonable solution.It depends on usage though, if you want to use it as an LCR meter up to 300MHz the much cheaper ones might even be preferred.For antenna / filter measurement over a wider range, I'd get the LiteVNA.

author: Aldo22
author_rank: Super Contributor
timestamp: July 10, 2024, 07:38:47 am
content: Quote from: KungFuJosh on July 10, 2024, 01:45:32 amYes, but Seesii is also OK and at least the Seesii Amazon store is officially recommended for the tinySA.I have tinySA and nanoVNA from the Seesii Aliexpress store and both are flawless.You can also buydirectly from Seesii.

author: woody
author_rank: Frequent Contributor
timestamp: July 10, 2024, 09:55:18 am
content: Quote from: ch_scr on July 10, 2024, 06:22:38 am+1 for this one. Get the 64.

author: kripton2035
author_rank: Super Contributor
timestamp: July 10, 2024, 10:00:08 am
content: I did not buy one actually, but I narrowed also to the eleshop litevna 64 some times ago ...

author: Aldo22
author_rank: Super Contributor
timestamp: July 10, 2024, 10:13:37 am
content: Quote from: woody on July 10, 2024, 09:55:18 amQuote from: kripton2035 on July 10, 2024, 10:00:08 amIt's a question of whether you want to spend around €50 or around €200.More expensive is usually better. The question is what you need and whether the extra cost is worth it for you.I don't really need to ask the forum for the tip: "buy the most expensive one".

author: ch_scr
author_rank: Frequent Contributor
timestamp: July 10, 2024, 10:43:28 am
content: Quote from: Aldo22 on July 10, 2024, 10:13:37 amIt's a question of frequency range. Up to 300MHz -> 50€; Up to 6GHz -> 200€.

author: Aldo22
author_rank: Super Contributor
timestamp: July 10, 2024, 10:53:27 am
content: Quote from: ch_scr on July 10, 2024, 10:43:28 amSure, that too, but doesn't the50€ version go to 1.5GHz?If you know that you need 6GHz, then buy the 6GHz version.The OP said:Quote from: Martin72 on July 09, 2024, 09:17:07 pm

author: tszaboo
author_rank: Super Contributor
timestamp: July 10, 2024, 11:30:13 am
content: Quote from: Aldo22 on July 10, 2024, 10:53:27 amIndeed, the model depends what you are trying to do.Bacon radio or ham radio, 300 MHz is plenty.Sub-GHz radio, test equipment like oscilloscope probes, coax cables, then the 1.5 GHz model is recommended.More modern digital radio interfaces work in the~3 GHz bandwidth, so the 6GHz LiteVNA model makes sense. It's 4x the frequency for 4x the price, which is a very good deal. To put it in perspective, I paid more just for a calibration kit for a "proper" VNA in the past.And while these units are not going to give the same dynamic range (decibels) as standalone units, 30dB of noise free range is plenty for anything antenna related.

author: ch_scr
author_rank: Frequent Contributor
timestamp: July 10, 2024, 11:43:51 am
content: Quote from: Aldo22 on July 10, 2024, 10:53:27 am"The 50K-300MHz-Range has a dynamic range of more than 70 dB. The extended 300M-900MHz-range has more than 60 dB and 900M-1,5-GHz more than 40 dB"As usual "it depends" but above 900MHz you'll really want the "better" one.

author: Martin72
author_rank: Super Contributor
timestamp: July 10, 2024, 11:45:48 am
content: Hello,Thank you for the numerous replies.What I was able to filter out for myself is that there is such a thing as "authorized" distributors.And it also sounds good that you can use the smaller, cheaper ones for LCR measurements, because that's what I'm interested in.However, I find the "larger" screen to be quite small, so the 2.8" models are a no-go.On the Nano VNA page, AURSINC is mentioned as an amazon dealer, which would be this device, for example:Nano VNA-F V2That would be OK then?

author: ch_scr
author_rank: Frequent Contributor
timestamp: July 10, 2024, 11:52:38 am
content: Quote from: Martin72 on July 10, 2024, 11:45:48 amI don't get the appeal? For like 5-10€ more you get the 6GHz LiteVNA already, and from a proper distributor. It comes with cables and cal standards as well.

author: Aldo22
author_rank: Super Contributor
timestamp: July 10, 2024, 12:07:50 pm
content: Quote from: Martin72 on July 10, 2024, 11:45:48 amThat's a matter of taste.The 2.8" model fits easily in your pocket and if you need it more convenient, there is the PC software.

author: pdenisowski
author_rank: Super Contributor
timestamp: July 10, 2024, 12:08:24 pm
content: Quote from: tszaboo on July 09, 2024, 10:31:16 pmI have a "vintage" NanoVNA and an H4. The H4 is much nicer, and I can do a FW swap to turn it into a phase and frequency analyzer.

author: pdenisowski
author_rank: Super Contributor
timestamp: July 10, 2024, 12:12:22 pm
content: Quote from: Aldo22 on July 10, 2024, 12:07:50 pmIf I'm putting my NanoVNA in my pocket (so to speak), I'm probably using it outdoors to do things like antenna and cable testing, and this is where a larger unit, better controls, and a nicer screen make a big difference. I would gladly buy yet another NanoVNA if someone would package it with better controls and a much larger/brighter screen.

author: Martin72
author_rank: Super Contributor
timestamp: July 10, 2024, 12:23:08 pm
content: Quote

author: Aldo22
author_rank: Super Contributor
timestamp: July 10, 2024, 12:33:17 pm
content: Quote from: Martin72 on July 10, 2024, 12:23:08 pmYou said:Quote from: Martin72 on July 09, 2024, 09:17:07 pmThat sounds like the 50€ version to me.If you need more range/bandwidth or a bigger screen, then compare the specs and buy the one that fits.I already said that in my first answer:There are different screen sizes and bandwidths etc.I don't know if there is the one "good one".More is usually better... and more expensive.

author: bingo600
author_rank: Super Contributor
timestamp: July 10, 2024, 12:47:49 pm
content: Martin i'd buy from eleshop.eu or eleshop.nl (eu shows prices wo VAT) - eleshop is authorized reseller.I'd also get a litevna64, if you need to play with freq's over 300MHzhttps://www.eleshop.nl/litevna-64.htmlOr you could start with a H4' , if Freq under 300MHz - But "Murphy" says in 2 weeks you want to check your 433MHz or WiFi antenna ....https://www.eleshop.nl/nanovna-h4.htmlBut if you go cheap (H4) - Then once you grow out of your H4' , and get a litevna64You can reprogram the H4 as a TinyPFA , and play w. phase analysis of Xtals or GPSDO'sDon't get the NanovnaH - The F072 MCU is too weak.I have a H4, a litevna64 , a V2Plus4 - But usually reach for the litevna64.I also have the TinySA Ultra - Cute little tool at the right price.Ps: The litevna64 battery draining issue that i have, should be fixed in the newer verions./Bingo

author: joeqsmith
author_rank: Super Contributor
timestamp: July 10, 2024, 12:50:14 pm
content: Its not just a matter of upper frequency. The LiteVNA's narrow band performance is really poor. The original NanoVNA will far out perform it in that case. If you attempt to measure power distribution networks, again the original NanoVNA will out perform the Lite. They are so cheap, you can spend $250 and have both.I am not aware of any 1.5GHz units. You can certainly use harmonic with the original NanoVNA / H4 that will allow you work up that high but the performance is really poor. Not to mention other problems it can cause.I always use the PC so the screen size and other options really are not important. That said, the original NanoVNA & H4 use a different protocol than the LiteVNA. If using them with a PC is important, make sure that what ever software you plan to use supports the VNA (before you buy).***Should mention that the LiteVNA64 also supports harmonics. Attached comparing the floor of my LiteVNA64 compared with my Agilent PNA. You can operate the LiteVNA64 even higher but as you can see, the performance is poor.Also, people will ask if their XXXXXXX brand/name cheap VNA will work with my software. I have a version that supports the older protocol. The firmware installed in these makes a big difference on how stable they are. I abandoned that project some time ago and now only support the LiteVNA64. There is also the V2Plus4 that supports the newer protocol. It will work with my software but because the firmware, it has fallen far behind. I have not used mine since I bought the LiteVNA64.The LiteVNA64 also has a new version of hardware. This new version improves the dynamic range a small amount but also appears to have a problem where the frequency is not stable. It doesn't appear to be firmware related but rather the hardware. The frequency seems to dip 50Hz from time to time. Both of my older revisions to not exhibit this problem. Just something to be aware of.

author: Martin72
author_rank: Super Contributor
timestamp: July 17, 2024, 04:18:11 pm
content: Hi,Update:I have an attentive user here to thank for the fact that I can now call a cheap used Nano VNA my own.I will look into it soon and keep this thread alive accordingly.Thanks for all suggestions!

author: knudch
author_rank: Regular Contributor
timestamp: July 18, 2024, 05:04:47 am
content: This specific model -F V2 I also have and it works fine...I think a better flavour of them.There are updates etc. from Manufacturer SysjointIn the mean while I bought a LibreVna....another class price/spec but I keep the NanoVna for portable use on antenna/cables etc.Good luck with it.Knud

author: Martin72
author_rank: Super Contributor
timestamp: July 20, 2024, 12:57:33 pm
content: I have now bought more toys to go with the toy.

author: tszaboo
author_rank: Super Contributor
timestamp: July 20, 2024, 01:27:38 pm
content: Quote from: Martin72 on July 20, 2024, 12:57:33 pmCan you post a link to that adapter set?Did you measure it?

author: Martin72
author_rank: Super Contributor
timestamp: July 20, 2024, 01:34:19 pm
content: Hi,AdaptersetI haven't done anything yet, I wanted to finish two LCR reviews (ST42, ET3502) and finally get to grips with my scope (SDS3104X HD) before I start working on the VNA.So it will take a while yet.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: July 21, 2024, 03:51:06 pm
content: How does the LiteVNA64 stack up versus NanoVNA-F V3 that is a tad newer.?If I recall, the LiteVNA64 uses 1x single MAX2871E synthesizer-chip or does it contain 2? while the NanoVNA-F V3 uses two 2x MAX2870 and a chip that are quite widely used-.Though very common synthesizer chips, looking at their sheets, - Different revisions.https://www.analog.com/media/en/technical-documentation/data-sheets/max2871.pdfhttps://www.analog.com/media/en/technical-documentation/data-sheets/max2870.pdfThe V3 is a tad more expensive than the LiteVNA64The LiteVNA seems to be spec with 10-1001 scan points, while V3 tops out at 801 points.The V3 seems to have a higher screen resolution 4.3" 480x800 IPS screen? while LiteVNA64 uses 3.95" TFT 320x480 screen.V3https://www.sysjoint.com/ueditor/php/upload/file/PDF/NanoVNA-F%20V3%20Portable%20Vector%20Network%20Analyzer%20User%20Guide%20V1.0.pdf

author: DaneLaw
author_rank: Frequent Contributor
timestamp: July 22, 2024, 12:00:23 am
content: Been looking into these models and trying to get my heading in regards to their inner pricing on the domestic Chinese market before VAT or third-party western-mockup.# DeepVNA# NanoVNA-F V2# NanoVNA-f V3# LiteVNA62# LiteVNA64# SV4401A# SV6301APrices from below vendors-listing on their own domestic sale-platform (Taobao/CN) and unit sale-numbers.https://www.sysjoint.com/index.php?tpl=product&pid=11&uid=17&sno=1&list=2&list2=1NanoVNA-F (discontinued)NanoVNA-F V2 119$ *NanoVNA-F V3 257$ *SV4301A 301$ *SV6301A 798$ **Domestic Chinese prices without VAT/TAX or shipping.Software, manuals, and PC toolshttps://www.sysjoint.com/index.php?tpl=service&pid=12&uid=19&sno=2&list=1&list2=1Though, You can find the V3 quite a bit cheaper, on western orientated sale platforms, even after 25%EUVAT & shipping..

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 14, 2025, 03:48:20 am
content: I bought 2 of these from ARSINC on Amazon, who is listed as an official dealer. For whatever that's worth.The nanaVNA-F V2 was okay, but I didn't like the size of it. So I ordered the SV4401A from them. I like the size it, and the N connectors.The screen quality is mediocre at best, and the touch response is inconsistent and occasionally annoying. I was okay with overlooking that until I tried using it connected to my computer.The nanoVNA-F V2 connected fine, no stability issues. It did what it was supposed to. The SV4401A was just a giant turd. Fussing with it with different versions of nanoVNA software (including the sysjoint crap and others), I was able to do only a couple sweeps. Each time it did a sweep, it then decided it didn't like being connected anymore. No thanks.I don't know if that model is crap in general, but the one I got from ARSINC sure is💩.Thanks,Josh

author: joeqsmith
author_rank: Super Contributor
timestamp: June 14, 2025, 01:42:16 pm
content: Quote from: KungFuJosh on June 14, 2025, 03:48:20 amPeople write me from time to time asking if my software is compatible with such and such VNA, running on WondowN. If it's not an original NanoVNA, H4, V2Plus, V2Plus4, LiteVNA, LiteVNA64 running Windows 10, then the answer is going to be no. I have had people tell me they have had success with Windows 11 and some of the other VNAs but I don't track which. Many of them, like the V2Plus/4, locked down the firmware. It would be fine if they actually worked but those two VNAs have fallen far behind.Personally, I would have no desire to try and support all these companies creating their own firmware. If they can't adhere to one of the two standards that have been out for several years now, that's on them. They would need to come up with something that puts them way ahead of the game to stir any interest on my part. Performance/cost of the LiteVNA64 and the now hacked H4 are going to be tough to beat.As for your problems, here is a thread from 2022:https://groups.io/g/nanovna-users/topic/sv4401a_review/93023189

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 14, 2025, 04:00:22 pm
content: I ordered and canceled the liteVNA more than once.I want it, and I don't. It has most of the shortcomings of the other little guy, and I hate the small size of it. If they eventually offer a new version of the liteVNA in a metal case, and/or a larger screen, then I'll get it.I specifically bought the crap from ARSINC because they're listed as an official seller on the Zeenko / nanoVNA sites.I know your software isn't compatible with them, that's not the issue. The software that is supposedly for them doesn't work with the more expensive unit, but works fine with the smaller one. Yes, I saw other people have similar issues with the SV model. It's not the software's fault; I think it's a hardware issue in the unit itself. I tried different driver options (cables, ports), removing any potential conflicts, and the story is always the same: little one works, big one doesn't.When I connect the SV4401A it appears to connect, and 20 seconds later it's disconnected. If you were lucky enough to run a scan in that time, cool.Thanks,Josh

author: Martin72
author_rank: Super Contributor
timestamp: June 14, 2025, 04:15:41 pm
content: Maybe you should skip the small stuff and get something from a brand-name manufacturer:Anritsu USB VNAThere will certainly be similar offers on “your” eBay.Edit: Argh, one port....Maybe there will be a 2 port version too

author: joeqsmith
author_rank: Super Contributor
timestamp: June 14, 2025, 04:40:54 pm
content: Because I run them from the PC, larger screen size, metal case, card readers.... are of no benefit to me. Larger = burns up desk space and gets in the way.If they offered it with even higher dynamic range, and better performance at low and >3GHz, I would buy one. Or, take the best of the NanaVNA and the LiteVNA combined into one product.When the crap one disconnects, it disconnects from Windows? What does it take to reconnect? Power cycle? Does it disconnect if the software is not running?Many of the experiments I have used these low cost VNAs for required they run for hours on end without an glitches.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 14, 2025, 04:53:08 pm
content: Quote from: joeqsmith on June 14, 2025, 04:40:54 pmThe com port always appears active in device manager when connected. The apps see it there, try to connect, and either briefly succeed, or completely fail.I want the things you don't need because I like using it as a standalone device. I want it to do both things. As a standalone device, the larger one is preferred. But it fails so hard with the connection attempts I want to smash it with a Gallagher-style sledgehammer.Quote from: Martin72 on June 14, 2025, 04:15:41 pmI think you know me well enough to know that I'm already annoying sellers on eBay looking for a good deal. 😉

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 14, 2025, 05:54:36 pm
content: Well,I found a version of nanoVNA Saver that stays connected to the SV4401A.It's version 0.3.10, and fantastically outdated. Annoying too. 🙄Update: Nope. This junk eventually gives the same/similar error regardless of version:QuoteQuote

author: joeqsmith
author_rank: Super Contributor
timestamp: June 15, 2025, 01:11:39 pm
content: At least you know it is not Windows dropping the connection. I would just ask out in the group.io for help. Maybe their is a fix by now.I just checked the price. It's about half of the LibreVNA. I think if I were to get another low cost VNA, that's the route I would go. Last I checked the LibreVNA + ecal was under $1k. And the developer has opened up the protocol (meaning I could potentially port Solver to it). Although, maybe his software is good enough as is. I evaluated some of the other software off and on. They never seem stable and are geared towards those that view the VNA as an antenna analyzer. The last I was corresponding with the LibreVNA developer, we we discussing eye diagrams. They had a good start. Local members didn't like the dialog and I bowed out. That's been years ago but I would guess their software has evolved a fair bit.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 15, 2025, 03:03:56 pm
content: I paid $500 for the SV4401A to get it from ARSINC on Amazon. You can get it a little cheaper from more questionable sources, but I will most likely return it and Amazon makes that easier.The firmware and software for the SV4401A are both old by at least 2 or 3 years. I believe it's fixable via firmware, but I also don't know if/when they'll bother. So I'll probably return it, and consider repurchasing if there's ever a fix for the stupid issues.I like the idea of the LibreVNA/CAL, and I might consider purchasing it in the future if the tariff situation changes and the price drops to something more reasonable. But I do want something that works as a standalone device for now.The F-V2 can stay reliably connected. I might make some DUT cables and live with it, or consider the SAA2N, but probably not that since it's older.Thanks,Josh

author: joeqsmith
author_rank: Super Contributor
timestamp: June 15, 2025, 04:12:01 pm
content: Maybe they have hard coded timeouts in the software that is causing your problem. Maybe those timers are based on the PCs execution rate. Do you have an older/slower PC you could try it on? Does the software you were trying to use have provisions to change the timeouts?With the original NanoVNA, I ran into a similar problem where the PC acts as the master and the VNA is the slave. The new protocol solved that. I have had people tell me that they used my software with some Sysjoint VNA but I have no idea which, what protocol they used, and did it REALLY work. I don't recommend spending any time going that direction, but it is available for those who want to try it.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 16, 2025, 01:19:44 am
content: I tried your software, and every other option.I tried different port configurations including different drivers, different speeds, reduced speeds, reduced buffers, no buffers, etc. etc.It's an issue with their crappy/outdated firmware. I wasted way more time messing with it than this thing is worth. They either need to fix it, or make their firmware open source so somebody else can fix it.

author: joeqsmith
author_rank: Super Contributor
timestamp: June 16, 2025, 03:39:44 am
content: Interesting. You tried both applications for the two protocols and both do nothing? From what I was told, I was thinking that you would get further than that. I just use the included Windows 10 drivers. There is no speed setting as it's over USB. The VNA is very slow by comparison so it wouldn't make much sense it that had any effect. Not having one to test, I can't offer you any suggestions.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 16, 2025, 03:48:24 am
content: There is a speed setting. It's Serial over USB, and serial has baud rates. They recommend 115200, but I tried down to 9600. Buffers can also be adjusted or removed.Their terrible support told me to try version 3.12 (old AF), and I told them I did. They claim that Sysjoint has a special version of 3.12 (though they didn't bother sending me a link to the version they claim works). They said "The Nano saver requires some Python configuration environment. If it still cannot operate normally, please try with a different PC." 🙄ETA:I asked them to provide me with a link to the 0.3.12 version that they claim works. Instead, they responded and asked if I have the latest 0.7.3 and shared a link to that. 🤣🤣🤣They're laughably bad. I wouldn't be laughing if it was outside the return period though.

author: joeqsmith
author_rank: Super Contributor
timestamp: June 16, 2025, 11:42:04 am
content: Quote from: KungFuJosh on June 16, 2025, 03:48:24 amIt is not an old time RS-232 port. It is USB. While I agree there are USB to RS232 adapters that you can indeed change settings like the BAUD rate, handshake ...., but that is not what we are dealing with. Early on I had someone telling me something similar and I ran some rough calcs for sweep times based on the maximum data rates. I think that is even covered in my users manual for Solver. While my software does have a placeholder for these settings, they do not effect the actual data rate. If they are the ones telling you this, I doubt you are talking with an actual developer. Rather some sales or marketing type.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 16, 2025, 03:43:37 pm
content: It's a virtual serial port over USB. No, it's not an RS-232 port, but that doesn't change what it is. A real USB connection is not the same thing, and capable of a lot more than this.The things I mentioned are standard methods of troubleshooting serial over USB ports. The end result is knowing that the serial over USB settings or drivers are not likely the issue here. It's either the device hardware or firmware (or VNA Saver software, which would still reflect an issue in the firmware/hardware if that's the problem) that gets in the way of itself.Also, the fact that the nanoVNA-F V2 works reliably connected for hours (assuming no glitch interrupts, which is possible and easily resolved by power cycling the VNA), makes it clear it's not the computer. The devices are practically the same outside of the screen size and VNA ports, which have no effect on the computer connection.

author: joeqsmith
author_rank: Super Contributor
timestamp: June 16, 2025, 03:46:50 pm
content: Quote from: KungFuJosh on June 16, 2025, 03:43:37 pmI am not sure what you are getting at. You still feel that changing the BAUD rate changes the actual data rate? This should be an easy enough experiment to run if there is any question.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 16, 2025, 04:06:45 pm
content: Quote from: joeqsmith on June 16, 2025, 03:46:50 pmIt affects communication between the device and the virtual serial port. Some devices only function if this is set to a specific value. I don't care about actual throughput.

author: joeqsmith
author_rank: Super Contributor
timestamp: June 16, 2025, 04:15:22 pm
content: Quote from: KungFuJosh on June 16, 2025, 04:06:45 pmChanging the BAUD affects the communications in what way? I assume the context of the thread we are still talking about these USB connected VNAs and not every product known to man.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 16, 2025, 04:42:51 pm
content: Quote from: joeqsmith on June 16, 2025, 04:15:22 pmThese devices, that we're discussing in this thread, areSERIAL over USB.Basic troubleshooting for Serial over USB devices includes the things I listed. The end result was that none of those changes made any difference, so it's not relevant anymore. Why continue to discuss it?

author: joeqsmith
author_rank: Super Contributor
timestamp: June 16, 2025, 04:55:55 pm
content: Quote from: KungFuJosh on June 16, 2025, 04:42:51 pmYes, USB is indeed a serial bus. But again, BAUD rates have nothing to do with the communications data rates. I continue to discuss it because the what was posted was not accurate. Again, this is very easy to prove to yourself physically, or on paper just looking at the data rates required.

author: voltsandjolts
author_rank: Unknown
timestamp: June 16, 2025, 05:24:06 pm
content: If the USB connection is direct to the MCU that is running the VNA, then as Joe says, baudrate setting makes no difference. The MCU firmware is just receiving and sending bytes over USB.If the USB connection goes to an IC which has a UART port connection to the VNA MCU UART, then baud rate will matter.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 16, 2025, 06:00:35 pm
content: Quote from: joeqsmith on June 16, 2025, 04:55:55 pmIt. Does. Not. Matter.If a device on a virtual serial port only works at a specific baud rate, then it will only work on that specific baud rate. Throughput is irrelevant. You don't have to believe me, but some devices that are set to work on 9600 baud, will simply not work, if they're not connected at 9600 baud. We're talking about finicky device connections in Windows, not physics.

author: joeqsmith
author_rank: Super Contributor
timestamp: June 16, 2025, 06:55:16 pm
content: Quote from: KungFuJosh on June 16, 2025, 06:00:35 pmI have never seen the BAUD rate (or any other settings) effect one of these low cost VNAs.The problem with propagating nonsense is others trying to solve their connection problems find such posts and waste time trying it. Which isn't a problem for me, except some of these people will ask me about the settings with Solver. Sure it's in the manual but some of these people refuse to read. I have thought about removing the BAUD rate from the menu just to avoid it.

author: joeqsmith
author_rank: Super Contributor
timestamp: June 16, 2025, 07:22:10 pm
content: Quote from: KungFuJosh on June 16, 2025, 07:04:26 pmIf I remove the BAUD rate I would have to answer how to set it as that's part of the troubleshooting.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 18, 2025, 10:56:12 pm
content: Quote from: joeqsmith on June 01, 2025, 09:55:04 pmI returned the -F V2 (probably going to return the other one too), and bought a SeeSii SAA2N. The 2N has no problems connecting to any of the apps I tried (saver, app, QT), and seems to stay connected reliably so far.The SAA2N also has DiSlord firmware.Thanks,Josh

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 23, 2025, 11:33:14 pm
content: Sysjoint release an updated SV4401A firmware (v0.7.0) that now works on Windows 11 with a custom version of nanoVNA-App from Sysjoint.The SV4401A is much nicer now that it...works.Thanks,Josh

author: DaneLaw
author_rank: Frequent Contributor
timestamp: July 24, 2025, 01:09:27 pm
content: Looks like there is an 25-27/6-25 "update" for most of Sysjoint's current VNA-product portfolio..(NanoVNA.F v3 (6.3G) and V2 (3G) and SV4401A (4.4G) and SV6301A (6.3G)https://www.sysjoint.com/index.php?tpl=service&pid=12&uid=19&sid=30&sno=2&list=1&list2=1&lang=enAnd a corresponding updated menu-treeF-V3F-V2https://github.com/sysjoint-tek/NanoVNA-App/releasesSysjoint GitHub NanoVNA repositories.https://github.com/sysjoint-tek

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 24, 2025, 03:27:16 pm
content: Yeah, I'm hoping they get their compatibility updates added to the official nanoVNA-App also.