开云体育

Hi Joe, The Q you will measure is the operating Q and that probably is the one you want. That is to say, we have the Q on the plate side of the tube and the Q on the antenna side... that is the 50 ohm

I have a NanoVNA-H4, Using it, It it possible to be able to measure the "Q" of a Pi output network of a HF frequency Amplifier? I can measure the match it is making for between the tubes and the

Jim, You are doing some interesting experiments. Explained very well and helped me understand the issues. I look forward to seeing how you progress. Thanks - Roger

Very good. Thanks.

It is easy to come to the conclusion that the S11 phase angle as seen on the nanoVNA (CH0 PHASE 90..) is the relationship in a device under test between the voltage and current in that device, and I

I'm still struggling with my faulty nanoVNA SAA-2N :-( In addition to the SAA-2N I have got a nanoVNA-F, a nanoVNA-H4 and a small "very tiny...". The other units are working ok, but I really want to

Sure, I think so. The bare NanoVNA has about 80 dB dynamic range.? If you lose 10-15 dB due to dividers, etc. then you're at 60 dB. It would be interesting to compare the "resistive divider" vs

Hi Jim, Do you think there is adequate dynamic range in this 2 vna system to measure a run of the mill device, like a 2N3904? At HF the s21 might be 20 dB while the s12 is -40 dB. Regards, Alan

On 10/14/21 6:03 AM, Roland Turner via groups.io wrote: > On 14/10/21 8:14 pm, Joe Smith via groups.io wrote: > >> Some background my be found at these two links: >> >>

Pretty much the cost - An extra NanoVNA is another $50, brand new - There are no $50 transfer switches, except used (maybe), and you need to make d

Have nanovna -H I think firmware 1070 Saver ver 3.9 When I measure swr on saver for a known antenna it never shows above 1.13 when I know it higher on vna screen looks close to correct what did I mess

OK, so a cost-and-integration-effort vs. isolation tradeoff. Interesting. Thanks. I very rarely want to be able to measure all four parameters, but did have an experience recently where the iterative

Some background my be found at these two links: https://www.eevblog.com/forum/rf-microwave/nanovna-custom-software/msg3659584/#msg3659584

Jim, What benefit does this approach offer over using a DPDT/transfer switch? Is this just a cost concern? I note for example that a transfer switch approach would solve concurrent access to multiple

I've run two instances of NanoVNA-Saver and it seems to work ok - here's a picture of two.? I scaled the image down so it's a reasonable size. I find that setting the font to 12 point makes it more

hello there is way to connect to PC I got 76 years and got some problem with sight, *Sent:* Wednesday, October 13, 2021 at 9:12 PM *From:* "Jim Lux" <jim@...> *To:* [email protected]

yes - here's some examples (a 21.4 MHz BPF and a 10dB pad)

I succefully got it ... MNI THANKS Peter

The DUT position is on the midle of the T ? *Sent:* Wednesday, October 13, 2021 at 4:56 PM *From:* "Francesco" <realfran@...> *To:* [email protected] *Subject:* Re: [nanovna-users] two

Hello Jim, I appreciate your availability to teaching and explaining your experiments and test with good manners, this is characteristic of one gentlemen. Thank you. The VNA is one instrument not in