RF Man - Impedance Matching in an RF Amplifier using Conventional RF Transformers and a NanoVNA

This video discusses impedance matching in a Push Pull Amplifier using conventional RF Transformers. It also shows how to use a NanoVNA to tune and validate critical design parameters including Return Loss (S11), VSWR, and Series Resistance on a Smith Chart.

[@jlog7395]

Such a great channel but the video technique is horrendous. Try a tripod and don’t zoom in so close. Would like to watch more of his videos but …

[@AB1Vampire]

Been struggling with impedance transformation and Reactance. This video brought me a big moment of insight. Thanks for posting.

[@rickeaston3228]

After the 30th "OK", I stopped watching and went to another video without the annoying OK.

[@delestebroacast8496]

Hello RF Man, how much does the Excel spreadsheet cost? It would be very useful for me, thank you.

[@sonax48]

What should be a good input transformer for broadband, from 3 to 30Mhz?

[@chrisscott1547]

Good demonstration, but the input match looks really narrow band!

[@Radiotreehut]

Very nicely explained Sir.Thanks

[@5940-c7w]

RF Man, Your insight is priceless and greatly appreciated. Thank you

[@bparker86]

You and Sharky are just awesome. The only two that seem to actually share knowledge with the community

[@JD-526]

Bravo.... somebody that actually teaches you. And explains everything, excellent work,

[@lyleengelbrecht4119]

WELL DONE YOU HAVE A MAGICAL CLEAR VOICE TO LISTEN TO AS WELL THANKS FOR SHARING YOU KNOWLEDGE AND NOT DYING WITH IT LIKE A LOT DO THESE DAYS GOD BLESS

[@user-su5sq5ib3i]

My teacher drilled that formula into my head Z= sqrt(x^2 + Y^2) I will never forget it. I need to make some spread sheets as well, its a great idea. I made up quite a few for my microcontroller and labview classes.

[@gregjones3660]

Thats a match made in heaven

Very, very nice !! No have a lot of mathematics, but has a lot of practical knowledge !! Pretty good way ! Thanks a lot !

[@sm6ehy816]

Suitable matching for 432 MHz with that MRFE6vp1k2 or BLF188xr ?

[@alessandrolatteo2915]

awesome video you can share the excel file Thanks Alex

[@alfredoandrade2585]

Your video clears and answer all my questions on impedance matching. Thank you Sir "RF Man".. Salute!

[@dankmemer8892]

I wish you could have been my professor for Linear Controls class! Thanks so much for this. By the way, isn't the NanoVNA wonderful? It allows us peasants to explore the wonderful world of RF. 73s

[@rfmanchannel6915]

Its a great addition to the lab at a great price!!

[@delestebroacast8496]

sir pleas can you share this excel?

[@allenmarian2005]

Appreciate your effort in making such informative videos.

[@rfmanchannel6915]

Thanks for your feedback. Much appreciated!!

[@allenmarian2005]

It would be nice if you can share the spreadsheets here

[@rfmanchannel6915]

Please email me and I would be happy to sent it to you. You can find my contact info on my web site. rflinear-amplifiers.com

[@researchandbuild1751]

When I see the transistor S parameters I thought you would have to make a matching network that would also cancel out the reactance so you would get maximum power into the transistor. Is this not so?

[@kittony71]

the simplest way is to measure from transistor side no need of variable resistor just terminate input or output with 50 ohms simple

[@TelstarElectronics]

Why are you using a purely resistive load (the pot) to simulate a complex impedance?

[@joaopaulocoelho5401]

Hi. Can you give me some more details regarding the 3:1 transformer uses at 9:32? In particular, how it was sized. I believe is coreless am I right?

[@user-su5sq5ib3i]

Say you are running class AB or B with a transformer that has a center tap secondary, do your turns ratio need to be divided in two so you would have half the amount of turns? EDIT you answered my question in the video

[@subramanianr7206]

Very well presented. Thanks and a big thumbs up to you 👍👍👍 De VU2RZA

[@nailuj45]

if you have zin for one transistor on input equal to 0.9 i multiply or i divide by two ? and for ouput ?

[@lyleengelbrecht4119]

WELLL EXPLAINED THANKS

[@user-su5sq5ib3i]

We got into calculating series and parallel branches of impedances as well as tank circuits at the end of the first year. We will be building some pretty simple things in the next semester but I really want to build high powered amplifier using one of these devices and incorporate a switchable matching network to use across the amateur bands. My vna should be here in a few more days. Looking forward to playing with that, Thank you for sharing this info. We havent learned the smith chart yet in school but having learned all of the theory already, I pretty much see whats going on in the smith chart, AC theory busted my balls LOL

[@rfmanchannel6915]

I'm happy you found this video helpful. If you need any help down the road, please feel free to contact me any time....

[@user-su5sq5ib3i]

@@rfmanchannel6915 I appreciate that!

[@delestebroacast8496]

sir pleas yes

[@zeljkoadzic1692]

sir pleas can you share this excel?

[@rfmanchannel6915]

Sure, please send me your email address with a your request. Regards

[@zeljkoadzic1692]

@@rfmanchannel6915 [e-mail]

[@zeljkoadzic1692]

@@rfmanchannel6915 dear thank you in advance

[@nikaldo7819]

amazing video

[@rfmanchannel6915]

Thanks for you comments!!