#502

[@EtheB1]

At over 72 years of age and having been 'off the tools' for the past for almost thirty years - thanks for making electronics interesting again!

[@IMSAIGuy]

Great. only 64 years here...

[@cache4pat]

Awesome presentation into the workings of the nanoVNA. You have made it very easy to understand the basics, thank you.

[@afernan10]

This is an enlightening video from beginning to end, thanks very much for making things so clear and understandable! I have seen it two times already and guess will be coming back soon, amazing! best 73

[@IMSAIGuy]

thanks

[@billpowell5931]

This is a great explanation of the Nano VNA design. In terms even I can understand. Thank you very much for sharing the information.

[@IMSAIGuy]

Glad it was helpful!

[@handyman7147]

I always wondered how such a cheap device could do so much. Thanks for demystifying the working. Never occurred to me the technique of mixing a high freq signal to bring it a low freq suitable for a low end A/D converter. Thanks.

[@pbaemedan]

Your explanation on bridge circuits is very good. Thank you for a great video.

[@Leo-pd8ww]

Very nice. Not too long ago we used Schering bridges to measure capacitance of high voltage components. You had to balance the bridge yourself, thus you had to understand what you were doing. Reading the capacitance involved understanding the settings of the knobs and multipliers. The same for a balance bridge for high voltage partial discharge measurements. The bridge is more complicated, but the principal remains the same. I still have a photo of the bridge somewhere. Nowadays it's all digital. Press the button, read the values. If something doesn't work, good luck figuring out why. Improved technology made a lot of knowledge evaporate.

[@AECRADIO1]

Load termination resistors had no difference in reference points if a slight 'bump' of the pin was present. The nickel bond of the resistors is to small to affect a change in a reference reading.

[@Mesa_Mike]

Very interesting. Thanks for this explanation of how the NanoVNA works! and now I understand why the "open" calibration plug is needed instead of just not putting anything on that connector.

[@rickwise9910]

Very nice, very informative! I think you got the wrong Zin for the H4. It's still 50 ohms, but it does attenuate more, as you said.

[@IMSAIGuy]

Yes you are right. had a senior moment

[@rickwise9910]

@@IMSAIGuy Still wonderful content!

[@zeno2712]

Thanks for that excellent explanation! I'm working my way through your NanoVNA videos and still getting used to what they can do - I will buy one hopefully some time soon but a bit confused by some of the different models/manufacturers/suppliers and have seen warnings about clones. Am I right in thinking that the H4 is made by a different company to the 'original' one? Is there a good guide to the different models?

[@IMSAIGuy]

I'm not sure who builds what. They all seem to work fine. I like the H4 for the display. Others like the ones with the big connectors.

[@zeno2712]

@@IMSAIGuy W2AEW has just uploaded a new video where he talks about VNA in general then moves on to the NanoVNA and has a summary of the different models here: kzbin.info/www/bejne/pWLIfX5qerKje7M

[@hebrewhammer1000]

Thanks for sharing the video. I learned a lot. I was a bit confused about the ch1 of the h4. I thought the impedance would be 50 ohms.

[@IMSAIGuy]

you are correct. I messed up

[@mjrtude]

You remind me of myself I am guessing we took similar paths. Ham radio since 1973 (K9IC) engineering as a profession. Always curious as to how something works. Nice explanation. I just bought a NanoVNA about a month ago..amazing piece of equipment that allows me to do things that I can't w my 50lb Agilent VNA.

[@LifeAtTerminalVelocity]

Great video. Perfectly explained and easy to ingest.

[@homerclese1954]

I was having a flashback moment to my high school electronics class when you where talking about the bridge networks

[@rjrodrig]

Lucky you. Our high school didn't even know about electronic hahah

[@DimasBenasulin]

Enormous video !!!! Thank you 73

[@IMSAIGuy]

Glad you enjoyed it!

[@eigenvector7035]

Any reason for the H4 version having a 200R in the middle of the bridge vs the original having 82R ? Great video, ive learnt a lot!

[@IMSAIGuy]

200 seems more seasonable than the 82. it's only a 50ohm bridge so the resistor in the middle should be larger than the bridge to not upset things but allow a current measurement between legs.

[@homohabilus63]

What a great video, I learned something.

[@aduedc]

Great clip again. I am designing a device that can measure body plot of feedback loop in an opamp. I was wondering how to measure phase, and I found a great paper on line by Peter O'Shea. "Phase Measurement." I found, there are many circuits to measure the phase, PLL, FFT, and 3 voltmeter method are the most practical for me. With above circuit that you presented one can use instrumentation amp and 3 voltmeter method to measure phase.

[@ghlscitel6714]

Very interesting and helpful. Chapeau.

[@MyTube4Utoo]

Incredibly interesting. Thank you.

[@allanjohnston3884]

Thanks for the informative video!

[@olympioolympio]

nice ! thanks !

[@TeslaTales59]

Great review on that tiny scope! I still use my Tek 100 Mhz. What model Omega are you sporting?

[@tonymon875]

Such a great video. Thank you

[@jvkew]

Great video! I needed that.

[@billallen275]

My first new ARRL Handbook was 1973.

[@IMSAIGuy]

me too

[@RideGasGas]

The paper schematic shows 10 micro henries (µH) but the annotation on the screen showed milli henries (mH). Might want to fixed that.

[@technophil7560]

Good explanation ! I learned something

[@mr1enrollment]

looks like ch2 of h4 is still 50 ohms?

[@IMSAIGuy]

yes, I commented I made a mistake before

[@mr1enrollment]

@@IMSAIGuy sorry i missed it

[@IMSAIGuy]

@@mr1enrollment brain freeze

[@IMSAIGuy]

i get a lot these days you get too relaxed in retirement 😉

[@handyman7147]

Thank you for your excellent tutorial videos. It is of immense value to electronics hobbysts and students. It will be nice if you could make a video on how the Single Mixer based LiteVNA62 works. It is sold by R&l Electronics. Thank you.

[@IMSAIGuy]

do you have a schematic?

[@Henrique09821]

woow awesome explanation!!

[@wolleausmallo1]

Now I know a little bit more. v73 de DL9WD