Why is coax unbalanced?

In this video, with some experiments, we shall see the meaning of "unbalanced" and "balanced" regarding transmission lines and their practical effects.

[@alexengineering3754]

This is the best video I have seen about this topic. I experimented with this a little bit but my results where nowhere that obvious. It is frustrating if some people share false information. Currents that come and go to nowhere violates Maxwell's equation's. I realy like how you made experiments to prove your point.

[@eddycuypers7621]

Very good explanation. Thanks. We need more of this on KZbin. Most of Amateur radio channels, on KZbin, are very weak..

[@jtcsrvbi]

this is the best explanation of CMC and balanced vs unbalanced I have ever found! 73 John NM2R

[@happydog6093]

I like the cow picture in your QRZ page. Thanks for the video.

[@johnpeterson7264]

Great video. I especially liked the graphical explanations. Thanks for posting !

[@joshtam58]

The best explanation I have seen of this. Thank you!

[@ve6wo]

Thank you. Very good information! I also made a video in an attempt to explain this concept. Yours is very well presented.

[@elijahsmith7552]

Great video. Thanks

[@kengerace]

Excellent video

[@hobbygaertner420]

That was really good. I thought I knew this already but you taught me a new view point.

[@louisseaman8455]

Davide, please comment on my observation: @1:00 you show current flowing on the shield in a dummy load "system", and that has to be the case for a dummy load. However in an unbalanced antenna system, your counterpoise acts as the r.f. ground, thereby limiting the amount of r.f. that can travel on the coax shield; in fact, with unbalanced monopole antennas, some hams even make a choke out of the coax at the antenna feed-point, further reducing or eliminating the current that can travel on the shield, especially when they are operating at a frequency slightly different from the antenna's resonance. A perfect example of this is your demonstration at 5:30, where your antenna system has no counterpoise, and therefore your coax shield is acting as the counterpoise to the extent it can, since the current is not being shunted at the feed-point by a counterpoise; on top of that, there is likely an impedance mismatch at the feed-point, making the effect worse. In other words, you haven't created a matching load at the antenna feed-point, so some energy will naturally have to find its way back to the radio to complete the circuit, and that is energy that is wasted. At least this is what it seems like to me.

[@angeloinam8446]

This is actually what I was looking for. Thanks

[@vo1pwf]

awesome job as always

[@actyon20]

I...want to kiss your hands for making this video...I can't thank you enough *I am crying !!

[@DE-iv8if]

Very good Video!

[@hubercats]

Excellent video. Thank you!

[@k2cwcqrp]

Excellent video, thank you! @3:10 the image shown resembles an end-fed half-wave (EFHW) antenna to me. In the case of an EFHW, something clearly DOES HAPPEN. So what is the difference between the image shown and an EFHW? Is there a ground connection in the EFHW?

[@lemonkey]

do you have plans for the ammeter you built that uses a snap on choke?

[@civillini]

grande da paura ..utilissimo per un radioamatore alle prime armi. grazie

[@zoolkhan]

Wow, italian operator using a dummyload !! never seen this before. just kidding, dont hurt me :-) Well done Dave, mille grazie

[@actyon20]

At min 6:21 is at page 239 in Reflections III: Transmission Lines and Antennas which you can download as PDF for free from archive.org

[@arthurleal2674]

Very helpful. Tks ki5op. small yard, need to make antenna for 160M. Or G5rv Marconi configuration.

[@kb9oak749]

My brain broke.

[@volkerblock]

Good Video! Thank you. What about at 6:28, if ARM 3 has length of a quarter wavelength?

[@markuss.1333]

Great!

[@d10valentin]

What about coaxial triax?

[@Scudmaster11]

Because twin lead is better