In this video, with some experiments, we shall see the meaning of "unbalanced" and "balanced" regarding transmission lines and their practical effects.
Пікірлер: 27
@alexengineering37549 сағат бұрын
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.
@eddycuypers76215 жыл бұрын
Very good explanation. Thanks. We need more of this on KZbin. Most of Amateur radio channels, on KZbin, are very weak..
@jtcsrvbi Жыл бұрын
this is the best explanation of CMC and balanced vs unbalanced I have ever found! 73 John NM2R
@happydog60936 ай бұрын
I like the cow picture in your QRZ page. Thanks for the video.
@johnpeterson72645 жыл бұрын
Great video. I especially liked the graphical explanations. Thanks for posting !
@joshtam584 жыл бұрын
The best explanation I have seen of this. Thank you!
@ve6wo Жыл бұрын
Thank you. Very good information! I also made a video in an attempt to explain this concept. Yours is very well presented.
@elijahsmith75522 жыл бұрын
Great video. Thanks
@kengerace2 жыл бұрын
Excellent video
@hobbygaertner4205 жыл бұрын
That was really good. I thought I knew this already but you taught me a new view point.
@louisseaman8455 Жыл бұрын
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.
@angeloinam84463 жыл бұрын
This is actually what I was looking for. Thanks
@vo1pwf5 жыл бұрын
awesome job as always
@actyon204 жыл бұрын
I...want to kiss your hands for making this video...I can't thank you enough *I am crying !!
@DE-iv8if5 жыл бұрын
Very good Video!
@hubercats2 жыл бұрын
Excellent video. Thank you!
@k2cwcqrpАй бұрын
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?
@lemonkey24 күн бұрын
do you have plans for the ammeter you built that uses a snap on choke?
@civillini Жыл бұрын
grande da paura ..utilissimo per un radioamatore alle prime armi. grazie
@zoolkhan5 жыл бұрын
Wow, italian operator using a dummyload !! never seen this before. just kidding, dont hurt me :-) Well done Dave, mille grazie
@actyon204 жыл бұрын
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
@arthurleal26744 жыл бұрын
Very helpful. Tks ki5op. small yard, need to make antenna for 160M. Or G5rv Marconi configuration.
@kb9oak7494 жыл бұрын
My brain broke.
@volkerblock4 жыл бұрын
Good Video! Thank you. What about at 6:28, if ARM 3 has length of a quarter wavelength?