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.
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.
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?
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.
Very good explanation. Thanks. We need more of this on UA-cam. Most of Amateur radio channels, on UA-cam, are very weak..
this is the best explanation of CMC and balanced vs unbalanced I have ever found! 73 John NM2R
Thank you so much for this upload,it has been very useful to me.
Great video. I especially liked the graphical explanations. Thanks for posting !
I like the cow picture in your QRZ page.
Thanks for the video.
The best explanation I have seen of this. Thank you!
Excellent video
Excellent video. Thank you!
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.
Great video. Thanks
awesome job as always
That was really good. I thought I knew this already but you taught me a new view point.
Thank you. Very good information!
I also made a video in an attempt to explain this concept. Yours is very well presented.
This is actually what I was looking for. Thanks
Very good Video!
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?
do you have plans for the ammeter you built that uses a snap on choke?
Good Video! Thank you. What about at 6:28, if ARM 3 has length of a quarter wavelength?
Very helpful. Tks ki5op. small yard, need to make antenna for 160M. Or G5rv Marconi configuration.
grande da paura ..utilissimo per un radioamatore alle prime armi. grazie
Great!
Wow, italian operator using a dummyload !! never seen this before.
just kidding, dont hurt me :-)
Well done Dave, mille grazie
My brain broke.
What about coaxial triax?
Because twin lead is better