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NanoVNA with bigger screen
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Pedro,
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most probably it was an nanoVNA-H4 (/g/nanovna-users/wiki#NanoVNA-H4) There are other possibilities, but they are more expensive. HTH, 73, Stay Safe, Robin, G8DQX On 28/06/2023 03:45, Pedro Madeira CT7AHV wrote:
Hello to all |
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On 28/06/2023 03:45, Pedro Madeira CT7AHV wrote:
Hello to allPedro, There are several, but the "LiteVNA 64" has coverage up to 6 GHz and gets good reviews and comments here. If 2 GHz is enough try the NanoVNA H4 Beware of clones.... 73, David GM8ARV -- SatSignal Software - Quality software for you Web: Email: david-taylor@... Twitter: @gm8arv |
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nanovna v2plus4, lite vna64, nanovna h4, nanovna -F V2, etc etc
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there are a handful of vna and vna v2 with 4 inch or 4.3 inch screens i recommend to use one of the newer v2 models that go up to 3 or even up to 6 ghz cause the older models (1.5ghz) only have a clock up to 300mhz and above that (900mhz or 1.5ghz) is measured in harmonic mode (with reduced sensitivity and dynamic range) ... the newer v2 models are much better on the higher frequency area maybe a lite64 is for you?? or a plus4 or ... a vna6000??? (a bit expensive in my view) greetz sigi dg9bfc ps an option is to buy a cheaper version and add a 4 inch screen to it ... just needs the fw for that bigger screen to be uploaded in the device Am 28.06.2023 um 04:45 schrieb Pedro Madeira CT7AHV: Hello to all |
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Hi Robert,
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I have tried several times to send a message to cqxiegu, but I never got an answer. I can't understand how a company like Xiegu can not respond to customer inquiries. Other hams have contacted me who have had a similar problem to mine and have gone through an odyssey to get it fixed. I hope I won't be forced to buy an icom 705, especially to avoid arguing with my wife....hi Thanks and 73 Maurizio IW2GOB Il 28/06/2023 15:58, Siegfried Jackstien ha scritto:
nanovna v2plus4, lite vna64, nanovna h4, nanovna -F V2, etc etc |
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Robert Rose
I recently bought the SeeSii nanoVNA-H4 which has a 4" screen. I love the larger screen. It is useful up to 1.5 GHz, but my use for HF radio is just 3 to 30 MHz, plus VHF and UHF, so this is fine for me.
If you look at the nanoVNA menu structure map you will see that the H4 gets you some useful additional functions, including two more memory locations and 201, 301, and 401 sweep points options. The extra sweep points come at corresponding increase in sweep time, however. As with all of the nanoVNA units, however, it is best to remember that the basic nanoVNA circuit design is open source, and you are getting what you pay for. Chief concern is component quality, shielding, and soldering. 73 Bob Rose "Zayde" robert.rose@... KN6UXD DM13ld SKCC 27222 |
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Hello to all,
Thanks for all your inputs, I made a few searches and I saw the devices you told. Actually, I just need to work up to 150MHz, I build solid state amplifiers and I need to tune the low pass filters. I also build antenna transformers, Baluns, Ununs and RF chokes and need to measure them. I have a nanoVNA S-A-A-2 which is useless because it doesn't measure Rs or Xs independently in S21 mode, only measures impedance complex. Tuning low pass filters with this nanoVNA is also not possible because the measurements are not accurate enough as my other VNA. I performed some comparisons and the Transmission Loss in dB is very different, and yes I made proper calibrations. The nanoVNA I have is just good enough to do SWR measurements... My goal is to have a VNA independent of the use of a computer, that's why I'm looking for a VNA with screen bigger than 3 inches! Which model should be the most accurate? I know all these are Chinese devices, but maybe I can find a reliable one for my works... Thanks, best 73 Pedro Madeira CT7AHV/C91AHV |
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On 6/28/23 3:30 PM, Pedro Madeira CT7AHV wrote:
Hello to all, Isn't complex impedance Rs + Xs j? But you said S21, which is also complex (although often displayed as magnitude and phase). But convertible to equivalent series R and X, with some math. There's been some discussion of this on the list, and it's not "instrument" dependent. Tuning low pass filters with this nanoVNA is also not possible because the measurementsThat seems odd.. how much rejection do you need to measure? (I'm assuming the passband isn't a problem). The little original NanoVNA does just fine at 60dB down, although I don't know that I'd want to commit to 1 dB uncertainty in the stop band. The NanoVNA is probably not the right tool for aligning a 6 can diplexer for 2 meters. My goal is to have a VNA independent of the use of a computer, that's why Well, yes - the tiny screen is a pain. I was checking some feedlines earlier this week outdoors and not only is the 3" screen hard to see, it's hard to take a picture of. But if you're tuning something on a bench, it seems a computer isn't a deal breaker. I use a RPi to talk to a NanoVNA using NanoVNA-Saver, and it will display on as large a screen as you can plug in. Thanks, best 73 |
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Pedro,
You write "I have a nanoVNA S-A-A-2 which is useless because it doesn't measure Rs orXs independently in S21 mode, only measures impedance complex." Recent firmwares from DisLord provide what you need for SAA2N (also for H/H4) about all Z variant measurements in s21 mode. Path menu is : DISPLAY / FORMAT S21 (THRU) / MORE At this menu level you can choose SERIES R, SERIES X, SHUNT R, SHUNT X and more. I have used succesfully these features for testing choke baluns. When it was not yet available, I proceed with external calculations (LibreOffice sheet) from s21 data file, but now you can display a graph in real time ! For sure, it does not provide a solution for a larger screen ... Please note that these s21 derived parameters are also displayed as discrete values in the right panel of NanoVNA-App (version 1.1.215 from DiSlord). I have enclosed the last firmware bin file for V2/S-A-A-2 (480x320 display) from DiSlord, version 1.3.18, if you want to upgrade your VNA. 73 - Jean-Roger |
David J Taylor
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