Fantastic vid. I was trained in Strategic Microwave Communications Systems Repair (26V20) years ago in the Army. Late 70s. They never had a vid as clear as this. Sure would have helped. Now I teach Middle School Science, and when we get to the sections on Energy, Electricity and Magnetism, I use vids like these to get the principles across to the kids. Thank you for taking the time to create and share this vid.
Outstanding video. I plan to require my employees (who are not trained technicians) to view this to give them a few more things to think about. I've had a ham license for 53 years and have been in the two-way and broadcast services industry for 42 years. I've been in business 31 years and I didn't know about the "solar winds" night time effect on the Ionosphere. There's always some thing new to learn before we ending up leaving this rock.
water blocks radio signal is not true. actually water carries rf further. when ever i go beside a river or lake or sea i get stronger signal than other places. i think they need a more to discover
This is also one of the best videos about radio in general and broadcast in particular that I have seen. I already took a few screen shots of it for a presentation that I made about radio relay systems for a sales colleague. I am RF system specialist, engineer and long time licensed ham as OZ7ACS too. I am trying to teach electronics and RF to my son and then I stumbled upon this excellent video. Keep up the good work and please make more videos like this one about more subjects within RF and antennas!
I searched through numerous videos looking to understand radio waves and antenna length and by far this is the best video I found. Thank you so much for making this video!!
This video is really great. I am astrophysicist (working in optical and infra-red astronomy) who will go observe soon with a large radio telescope, thus I needed to learn as much as possible about radio stuff (telescopes, antenna, polarization, receivers,...). This video really helps. Thanks!!
What happens to the electrical signal as it reaches the radio wave? Does it generates a high frequency electrical signals and low voltage or maybe I'm mistaken?
This one single video is more informative than hundreds of articles about radiowaves I've ever read! I had no idea that radio waves had polarity! Thanx a lot!
I get it. You are matching antenna geometry to a holographic radio image in space to tune the frequency in space. Capacitance, reflectance and phase make space. Excellent video.
Excellent , the best explanation I have ever seen . I'm an ignoramus when it come to how radio works . And you have helped me a lot to understand how it works . Thank you for posting !
For explanatory purposes, I like the optical engineer's view of RF; photons coming off the antenna in response to the varying AC driving voltage. As the driving voltage builds, it excites the conduction electrons into a higher orbit, and when it drops the electrons return to a more stable orbit, releasing their energy in the form of a photon at the frequency of the driving voltage. The photons, traveling from the antenna, are picked up by the receiving antenna and induce a voltage in the antenna elements.
11:02 is what makes world wide radio contacts a regular thing for Amateurs and Broadcast stations. It's a bit more complicated than presented here and many more factors play into it. The lower frequencies are more predictable and the higher ones can be "magic" hence the "Magic Band" of 6 meters (50-54mHz in USA). Enhanced propagation is what makes things exciting on the amateur bands.
As a young ham i used to love 'sporadic E' some summer nights to talk up to 100's km's on my 2 metre homebrew. The E layer in the ionoshere sometimes ionizes in a way that VHF signals would bounce off it thereby effectively lengthening the horizon, sometimes for seconds or minutes occasionally for hours lol. In the 1970's govt's published prediction tables for HF propagation over DX, as different bands fron 3 to 30mhz would bounce repeately at different times. This enabled os staff to warm up the next Tx ready for opening, to keep those RTTY's going. Music to my ears!
Excellent video, narration and animationns! This is EXTEMELY helpful for me to send to my sons who I am getting into Ham / Amateur radio! Thanks so much and keep them comming! :)
I have looked all over the place for some explanation about radio polarization. Especially what circular polarization is. Never would've thought i'd find the answer in a youtube video. Very detailed information in your video, thank you very much.
Brilliant! This is the best informational video I have ever watched on you tube! Very easy to understand!!! Radio waves have been difficult for me to grasp but this video helped me under stand soooooo much! Thank you sooooooo much!
Dishes are used for very high frequencies, in the Gigahertz. The parabolic shape of the dish focuses the high frequencies into a very tight beam, this allows almost all the energy to be directed in one direction. When receiving the dish again focuses the received signal and amplifies it. Dishes work with both horizontal, vertical and circular polarized RF.
Not sure about anyone else. This was very helpful on understanding how to use my RC to pilot my drone much farther I didn't understand that I had to be pointing my flat panels at the craft.
I believe the crossed polarity as you've described is "dual polarity". Circular polarity is when the horizontal and vertical signals are out of phase and create a rotation in the polarity. A spin stabilized satellite most clearly demonstrates how circular polarization works. This WIKI has an excellent graphic and explanation: en.wikipedia.org/wiki/Circular_polarization
Awesome, very informative. I have got many answers to the questions that i used to think when i was a kid haha. Thanks for sharing and making this wonderful and informative visualization about Radio Waves.
The tallest antenna was the Warsaw antella at 2,120 feet, but it collapsed. Today, the tallest antenna is the Tokyo Skytree antenna at 2,080 feet. In Ontario, Canada, the CN Tower, standing at 1,815 feet, is an antenna that also serves as an observation tower for people. The smallest antenna is only 14 mm by 11 mm. This was a great video. They should have mentioned the layers of the atmosphere, identified by capital letters (D, E, F1 and F2, increasing in height in the ionosphere), which reflect radio waves, and are different between day and night. For example, only during the night does the D layer reflect back to Earth SW radio waves, such as 2 meters to 80 meters, used for continuous-wave communication (Morse Code) by radio (Ham) operators. Frank Reiser M.S. KB2VNG Frank Reiser Video/Audio Service Caldwell, NJ., U.S.A. (973) 226-3476
