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Sysjoint SV4401A nanoVNA
10
So i bought one of these on Amazon (SV4401A). They're $150 less on Ali Express, but i don't entirely trust Ali Express -- i've been burned twice by them. The last "burn" was $24 worth of fake coax. Not worth returning. Anyway, this SV4401A is great and does what it's supposed to do. BUT there are spelling errors on the main screen, unbelievable. On the main screen, bottom right, there is a 'button' labelled RUNING instead of RUNNING. There was another typo as well, but i can't find it at the moment. I guess that can be fixed with a firmware update. Best 73 Orrin WN1Z
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Nano H4 unable to connect via USB to Linux machine for VNASaver.
3
I have tried searching the group.io archive and got nowhere. Hopefully this is a new problem, and I didn't just miss it. I flashed this H4 just over 2 years ago (Feb 2023) to version 1.2.19 using this same hardware but a then-current version of Debian Linux. Now I'm using a newer Debian version (Bookworm), and cannot connect to the Nano in any mode, scanning or DFU. "new full-speed USB device number XX using xhci_hcd" "Device not responding to setup address." "device not accepting address XX, error -71" "XX" increments at every attempt to connect. The only difference I can find in my notes from 2 years ago is the kernel module is no longer "uhci_hcd," and is instead "xhci_hcd." Has the Linux community "upgraded" me beyond the ability to flash this thing? Am I needing to get the serial port dongle and some grabber clip leads?
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Apologies if flogging a dead horse! CAL Correction?
23
I've only just found and joined this group and am using a donated VNA for the first time. So I apologise if I am repeating a topic that is hidden deep within the history of this group. In the CAL menu there is a Correction option but I cannot find any mention or explanation of it despite Google being my friend, and it is not covered in G4WNC's book, "NanoVNAs Explained". What is the purpose of the CAL Correction option and what effect does it have on the VNA? TIA ES 73 DE G4SDW Gareth
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NanoVNA saver cannot connect to NanoVNA vis com port error
Well NanoVNA Saver 0.6.5 used to connect to com port on Win 10 and now it does not. I start the nanovna software, turn on the NanoVNA and when I click Rescan the software crashes off. If I turn on the NanoVNA first and then start the software I get Failed to execute nanosaver could not open Com 5. When I check Device Manager com ports I see Com port 5 and the yellow triangle. I deleted the com port and plugged the C cable from the NanoVNA-H into the pc and the com port 5 reappeared with the yellow triangle. So I downloaded Nanosaver 0.7.3 and with NanoVNA turn on then start nanosaver 0.7.3 I get the com port 5 error. If I start nanosaver first and then turn on NanoVNA-H I click rescan and nothing happens. The yellow triangle on the STMicroelectronics Virtual COM Port (COM 5) is causing nanosaver not to connect to pc. I have downloaded latest nanovna saver driver and when I try to update Win says I have the latest driver. I am stuck as NanoVNA saver used to work, any ideas how to remove yellow triangle from Com Port 5 I think that's my issue or I am missing something else. Mick N3OJP
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NanoVNA F V2 not working correctly
5
I have 2 VNAs . H4 and New F v2. Using the H4 to measure coax length I get a reading that's spot on. But when I use the F V2 the reading is like 60% or more / greater than it should be. H4 at marker reading at top right on the screen 16.01 meters for a 52 ft RG-8X coax. But the F v2 shows for the same coax 1034. m, I know the V2 is different in the menu layout than the H4 and I dont have a menu for the V2. There is something wrong that I'm doing or the F2 VNA is bad. Cliff W4CBH
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SD card format?
9
#beginners1
New H4 owner. Does the mini SD card have to be formatted before use? 73 Paul W2ECK
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problem started when i attempted to upgrade, screen went black, foolishly did not save the old version.. now i can read the vna with stm32, it even appears to write the new firmware but still a black screen, how do i know if i am using the correct firmware for my vna? what are the correct steps to read and program with stm32? i must be missing something, any help would be appreciated. thanks for any advice Bob VA4BG
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Hi, Currently trying to design and tune a 1/2 end fed antenna (RF is applied on one end), I am looking for the correct method to measure its impedance. As this one is very high I don't know the right méthode ! The result of this measurement should allow me to create a Stub with SimNEC to tune it. Thanks in advance for your help -- 73 s Christian F8GHE
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My NanoVNA-H4 is bricked. Is there a manual internal switch to reset?
3
Mine is not seen by Win 10 device manager. ( tried 2 cables and machines) I heard there is a way to get it out of DFU mode internally? Mine did not die updating firmware, but it was hooked up to PC using "saver" program I think. I installed the dfu se demo and file manager, but it's useless since PC can't see the device
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Since most filters are a series of resonators of some kind or another, terminating them in a resistance other than the design resistance will probably change the filter characteristics. Consider a filter that effectively has an input that is a RLC circuit, where the R is the terminating impedance of the source. If you change R from, say, 300 ohms to 50 ohms, then the Q will be different. That will certainly change the skirts, and will also probably change the overall passband (since most filters are stacked up responses of multiple resonances).
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Folks, Using the NanoVNA as a signal source for Ground Penetrating Radar (GPR) was discussed a couple of years ago. Today on Hacker News, there is an article about a home-built Synthetic Aperture Radar (SAR) unit using a freq around 6GHz. https://hforsten.com/homemade-polarimetric-synthetic-aperture-radar-drone.html The article discusses theory and the problem of finding a suitable Rcv A/D. The LiteVNA has the freq range, is capable of resolving nS time (to a certain amount), can measure phase and is programmable. The big issue is probably the switching time of the generator/reflection ICs in the front-end of the LiteVNA. As for the A/D spec, would the heterodyne method and DSP used be a limiting factor? So - might it be feasible to make use of the LiteVNA in a simplified radar setup using an external controller and appropriate antennas? Could the TDR routines be adapted? Could the LiteVNA be used with a TinSA-Ultra and a controller for something? Just thinking out of the box here. In my 60+ years of Tech, I have always looked at repurposing stuff. So, instead of "not possible" answers, I would rather hear what might need to be changed (electronics /software) to achieve a minimal proof of concept. Thinking caps on.... ... Larry
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I am a new NanoVNA user. Mine is an H v3.6. No firmware updates have been done. I have been using it only for a few days. Sometimes, on sliding the switch on, the screen is blank, but the blue LED is lit. After a few on/off cycles, the screen becomes functional and I can use it. Does any of you have a similar problem? Jon, VU2JO
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Hugen FW update
2
https://github.com/hugen79/NanoVNA-H/releases/tag/1.2.43
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Blew the front end of my H4 :(
4
Today I was doing two things at once, and unfortunately transmitted 400W of SSB into my inverted-V while my nanoVNA H4 was still hooked up to my OCFD antenna! Although they are perpendicular, they're not far enough apart to save the front end on the H4 :( So - how difficult is this to repair? Are the parts expensive, or too small to replace by hand (i.e. should I just buy another)? Thanks for any helpful hints. -Charles
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alternatives to nanovnsaver?
5
What are the alternative to vnasaver? I got it running fine but discovered that it is painfully slow and it doesn't mark frequency line in small increments. What I want is something that is fast as the standalone vna so I can do some what ifs regarding antenna tuning for various frequencies and save the results as well. Maybe VNA_QT does that? My surfing on VNA_QT seems to indicate that I would have to reflash my 5 year old VNA. Plus I don't know if its faster or how easily one can store output files. I've had reasonable luck reflashing other devices so I think I could do it w/o bricking but if VNA_QT isn't faster then its not worth the effort. I know I shouldn't complain, after all its all free. 73
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SVHFS Conference 2025, Call for Papers & Presentations
Here's an update on the SVHFS 2025 Conference; Deadline for papers has been extended to March 17 Conference & hotel registration is open; details are in the attached file. Thanks, Robin Midgett K4IDC
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looking for beginners guide to connect vna to pc
5
is there a beginners guide to connecting your nanovna-h to a pc? It may not be as simple as I am thinking. I have a nanovna-h edy555 ver 0.4.5-1 efbbceca when I connect it to my pc it shows up as usb std ser com3 then I launch vna-qt but it doesnt seem to know its there. clicking on devices does nothing. Is my choice of software wrong? 73 thanks
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Measuring signal levels Re: [nanovna-users] Adapting the LiteVNA for SAR?
VNA is the wrong tool (coherent detection depending on harmonic structure, and with a single detection bandwidth). Use a nano Spectrum Analyzer
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NanoVNA-H Connecting
5
Not able to connect to any apps. PC, Web, and Android. Used OTG Cable, USB a to c on PC Version 1.1 What am I missing Tks, RogerC
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The scroll button change the Start frequency
3
Hi All I have H4 + 1.2.40 , after some use without problems , i have a serious bug with the scroll button , it does no more change marker frequency but start frequency , is it normal ? may be i am missing some setting ?? 73's Nizar
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Sat 8:39am