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Re: nano vna h black screen
Thank you, will get back to this later this evening, it did come in a case, if the version is not on there i will check the chip. Will let you know how it goes
By VA4BG · #39606 ·
Re: nano vna h black screen
From your photo it appears you have a NanoVNA-H4, (the 4 is for the 4" screen) hardware version 4.3, or perhaps a good clone. Did it come in a case, or was it just the card and screen? Most 'official'
By Stan Dye · #39605 ·
Re: S-Parameter Plotter
Don Brant sent me an .s2p file to help test my plotter. It's for an amplifier with several feet of cabling. When I looked at the phase response, I knew I had found a new poster child for the virtues
By Brian Beezley · #39604 ·
Re: nano vna h black screen
Device manager just tells me best driver is already installed but all i get is stm bootloader showing up in USB devices
By VA4BG · #39603 ·
Re: nano vna h black screen
Thanks for the reply, nowhere on the board do i see any reference to ms,si or zk, where should i be looking? Also have installed dfuse demo but running cannot get the correct driver. Looked in the
By VA4BG · #39602 ·
Re: nano vna h black screen
What firmware are you trying to use? If you are using Hugen79's firmware then pay close attention to the image you downloaded. I ran into a black screen after upgrade as well caused by me mistakingly
By juancb@... · #39601 ·
Re: nano vna h black screen
reply. Much appreciated
By VA4BG · #39600 ·
Re: nano vna h black screen
I should have included in main body instead of just a lower case h in subject line, my apologies for poor description. Pic attached from board, thank you for the
By VA4BG · #39599 ·
Re: nano vna h black screen
shoot in the dark .. a nano vna H ?? dg9bfc sigi Am 02.03.2025 um 16:21 schrieb Tim Dawson:
By Siegfried Jackstien · #39598 ·
Re: nano vna h black screen
Telling us what model Nano-VNA you have would be a good starting point. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
By Tim Dawson · #39597 ·
nano vna h black screen
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
By VA4BG · #39596 ·
Re: High impedance measurement with VNA?
Jim, thank you a lot for the detailed information. I will be able to do some surgery on one of the NanoVna gen111.taobao.com firmware, which I updated to 0.3.0m. I will have to check the schematics
By pattymorr@... · #39595 ·
Re: High impedance measurement with VNA?
The NanoVNA doesn't have a separate Source and receiver ports, so you can't do the external amplifier, coupler approach in the Rackley paper. Is there a reason you need high power for the test? (that
By Jim Lux · #39594 ·
Re: High impedance measurement with VNA?
The NanoVNA doesn't have a separate Source and receiver ports, so you can't do the external amplifier, coupler approach in the Rackley paper. Is there a reason you need high power for the test? (that
By Jim Lux · #39593 ·
Re: High impedance measurement with VNA?
From amfone :https://amfone.net/Amforum/index.php?topic=37502.0;wap2 John K5PRO: Before the days of plastic antenna analyzers, you either used a GR bridge or a slotted line (for VHF), or just knew the
By pattymorr@... · #39592 ·
Re: High impedance measurement with VNA?
Thanks Jim, now I understand better. So, I will build a LC tuning circuit and I will measure afterwards to adjust it. -- 73 s Christian F8GHE
By Christian BARTHOD F8GHE · #39591 ·
Re: S-Parameter Plotter
I've added impedance measurements to the S-parameter plotter. It now includes the one-port reflection method and the two-port series-through, shunt-through, and Y21 methods. Y21 cancels stray port
By Brian Beezley · #39590 ·
Re: Am I in the right track ?
Roger, Thanks. I thought I had replied yesterday but apparently not. Well, let me shop some 0603 resistors and ferrites and I'll come back once I get something decent. Also, my board is scrap. 1- I
By Nico · #39588 ·
Re: High impedance measurement with VNA?
Some of those techniques are more about measuring a high impedance component, so they wouldn¡¯t work. You¡¯re making an S11 measurement - it¡¯s just challenging because for end fed antennas,
By Jim Lux · #39587 ·
Re: High impedance measurement with VNA?
Jim thanks very much for your advise. During this afternoon I found these urls and now I don't know what is the best way to measure my end-feed antenna : Your or one of these : -
By Christian BARTHOD F8GHE · #39586 ·