#903

Episode 903
I will explain those strange curved lines and graph. Math guys like to use 'i' and engineers use 'j' but they are the same thing.
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[@subramanianr7206]

Hi, very well done. Thanks for the nice presentation of the basics of representing pure resistive component and the reactive components on the curvilinear graph. When calibrating the nanoVNA the short will be on the left extreme, the open on the right extreme and the 50 ohm in the centre. Upper half represents +j (inductance) and the lower half represents the -j (capacitance) It's our aim to achieve the 50 ohm pure resistive value as much as possible; and we strive to bring it there by having a capacitor in series when we encounter an inductance by rotating the point. It's obvious we do other way around when we encounter capacitive reactance by introducing inductance in series. Our transmitter is going to be happy. I have been watching your videos on the nanoVNA from the beginning, almost 2 years ago. Again thank you very much 👍👍 VU2RZA

[@jdmccorful]

Don't think you could make it any simpler. Now I know, thanks.

[@kd4nc]

Excellent! Back to the Basics.. Well Done…. I needed that….

[@DrHWO]

Cracking explanation chief! Now I’ll be able to find all of those little bugs in the bedroom……………

[@M07RealKing]

Great video and well explained. BTW, this reminded me of something interesting I read awhile back, so apparently some people use an RTL-SDR dongle as a spectrum analyzer, some even replace the crystal with a TCXO to increase the accuracy, really interesting.

[@IMSAIGuy]

yes, that is a simple way, Not a true spectrum analyzer but would be fine for many applications.

[@Northern-Rambler]

Brilliant explanation, thanks!

[@DavidThomas-mb8ew]

Probably the best explanation of a Smith Chart I have seen. Please can we have more on the subject i.e. regarding inductance and capacitance and antenna matching? Thank you for your great videos.

[@TonyBarr99]

Bravo! on the "spider web" analogy. That was perfect!

[@IMSAIGuy]

Glad you liked it!

[@jainmanish123]

Thanks for another great video it was really easy to follow you really explained it well by building it up from the basics Thanks again

[@IMSAIGuy]

Glad you enjoyed it!

[@sullivanzheng9586]

The whole smith chart thing is actually based on *bilinear Moebius transformation*, and is closely related to *inversive geometry*(where a line will be mapped to a circle and a circle will be mapped to another circle almost surely).... It has quite deep geometrical root in complex analysis and geometrical transformations. The key thing is that - such arrangement of coordinates makes inverse of a complex number very very straight forward. For any circle on smith chart (which could be a circle or a line on cartesian coordinates), its inverse will be a circle. So it is incredibly easy to compute impedance of ladder shaped LCR network by quickly inverting any impedances.

[@ka2pbo]

Outstanding ! Love your breakdown on this and other videos I've ben binging since finding your channel a few weeks ago. 73 !

[@IMSAIGuy]

here is a more technical one: kzbin.info/www/bejne/h4S8aZ5ofrR9p8k

[@ka2pbo]

@@IMSAIGuy Thanks. Wow ; that was fun! Watched it last night and again this morning. More technical yes; but explained but you made it easy to follow along. 73 !

[@QuigleysBees]

Just curious. Were you a primary school teacher (grades k thru 6th) at any point in your working career? I'm certain you could have explained the smith chart to them and they would have had no trouble understanding. Thanks for spending time making these videos for us. You are making a difference in helping me become a little less like a deer staring into headlights.

[@IMSAIGuy]

I never had a teaching job

[@chriswalford4161]

@@IMSAIGuy : I think you were well-employed whatever you did, but I also have a suspicion you missed a vocation earlier (if not as lucrative). Your explanations are very good - stripped down and simplified, plus the confidence of having depth of experience.

[@mr1enrollment]

well done

[@billpowell5931]

Nice explanation. Thanks.

[@joeg7849]

Excellent!

[@jfsaraceno9265]

And the intersecting lines are always perpendicular.

[@danielepatane3841]

Vector dimensions I suppose. Impedance has a resistance plus something else (reactance) that could be of 2 types....thnx for keeping my brain working greetings from Italy :-)

[@1John5-12]

Previous knowledge? What Previous knowledge! But,now I get it. 🤨🤔👍 thanks

[@IMSAIGuy]

Glad to hear that!

[@DEtchells]

GREAT explanation of Smith charts, I finally (almost) understand what all the funny lines are! One confusion though: You said that the circles with their bisectors on the horizontal axis are constant resistance, correct? How is it that they all pass through infinity then? I get that we’re talking about resistive vs reactive impedance, but don’t understand how there can be two points, both with a zero reactive component, and somehow having the same 50 ohm resistive part, when one of them is also infinity (??) I must have missed something fundamental, but don’t know what...

[@danidatasystemsindiapvt.lt9251]

Any videos on tuning RFID ceramic, patch antenna

[@IMSAIGuy]

no

[@hiflyer1825]

There is no X axis on a smith chart. It is an impedance [Z, Y, R] graph. It's shape tries to represent three dimension relationships.

[@enojelly9452]

Japanese notebook?

[@IMSAIGuy]

amazon has them from a company called RETTACY