Directional Antennas




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Wisdombylearningtruth :): can those radiation waves effect us

Robert Mitchum: A very nice explanationon on the simple physics on how a Yagi works. We can get into antenna patterns and side lobes at a later date. I really love the idea with the light bulb, a perfect way to show the lensing effect the reflector and the director have on the dipole. Do you think an explanation of the inverse square law, and the laws of reciprocity, would be too much? 

TheMan1510: This is the best demonstration of how a directional antenna works that I have ever seen! Thank you very much for posting it as it has really helped me to understand how each of the elements contribute to the antenna's overall performance.

The DXZone.com - Ham Radio Guide: Directional Antennas - YouTube

Hamilton Carter: When I was posting about directional antennas a few days ago I completely missed this. Here's Make Magazine's +Diana Eng demonstrating a Yagi antenna using a ham radio and a light bulb/antenna receiver. #physics #hamradio #amateurradio #stemeducation 

L.T. Easterly: Yagis, HOW DO THEY WORK? #swl

scott91372: Very good video.

VViitard: wtf, thats my aunts name lol

leloodallasmultipass: awesome. luv it.

SouthTuningSwiss: Nice vid! 73`s from HB9THC ;-)

PetrFM: Geek chic

Dirkzero1: imagine 300 of these, pointed straight up, pushing 50 BILLION watts of energy into our upper atmospheres... think that might create some problems?

jim hale: Nicely done. That makes it real for me.Thanks!

Tafheemwii: You would? I'm pretty should I wouldn't..

mashurst: What a great way to explain the yagi! I love the light bulb setup. I'm so making one. thanks

Nader Omer: Great work tnx for the wounderful viedio ,FB, 59 PLUS notice:- make sure not stand infront of yagi while transmmiting . safity first :-0 73&88 ST2NH

PrisonEarth: Wow Diana you are so perfect

zooky443: You are amazing.

ClamChowder44: hey you're from project runway

pinchiecajones: you can even use a yagi antenna on a uhf & scanner radio

tj7729: Wow, that was really helpful to understanding the reality of yagi's. I've always 'known' they work but never thought it could be so clearly demonstrated. Nice job!

kahvac: Excellent video ! the demonstration was very clear and easy to understand. I just might build my own. Thanks for taking the time to make it.

Kishore Vagisetty: hi diana, ur fantastic in explaining the yagi antenna !!

Bees Bee: What would be amazing is if someday they can use this type of technology to charge portable devices such as laptops or cell phones

invisibletime: cool

mark nunez: hot smart asians XD

mongojerry72: Nice demonstration. A fashion designer with brains? Refreshing combination.

VonDenHottentotten: I've seen sweeter. The glasses ruin it for me. Oh, wait, dude! This video isn't about cute women.

drakon32: Excellent!

Jacobsenacc: Yea, I seen a demonstration made by some large company, lighting up a lightbulb from across a room. But they said then it was dangerous from doing it across a room.

QatarOwner: nice video 73a de A71CV

Christopher Gillespie: OK, have it your way, Kelly. I guess all those FCC cars with DF loops trying to triangulate (horror gasp) operators without a license, but who otherwise respected the courtesies of vox operation... were all our collective imaginations aye? Enforcement for Enforcement's sake (oh, and to get the money out of their pockets which THEY OWE US!!!). Just catching gross interference were they? Sure, sure. I don't think we've anywhere much left to go with this convo. Have a good one - and cheers.

The Faustian Man: Tesla was right about sending power through the air. Too bad he ran out of funding.

quest33613: GREAT JOB!!!

HGarden27: o i see... well there must be a way to keep power in a wave like from. i think that once we figer that out we would be able to work in small worm holes in time.

flahr1: @catmaster141 any alternating current in a wire creates radio waves...simple huh Satellite TV, Cell phones, microwaves, bluetooth etc. all transmit are radio waves with different frequencies (of alternating current frequency).

MorikoKitsune: wow she is just every where...she has been on threadbanger several times.

Probewitch: Sweet. We could use a teacher like that to tour our motorola centers.

2627mhz: Good job...

Jacobsenacc: It looks like this technology could really send small amounts of electricitry across a room... Too bad you get radiation poisoning if you use it for that purpose. Maby we could power more than a lightbulb in the future.

patrickdarcy: well done

catmaster141: Yup, thats already an idea, having giant solar panels and space and then beaming the power down in the form of radio waves and collected in giant areas on the ground. Its being tested on a smaller scale.

sneakerset: Diana's set-up is a home-built cross-polarized dual band antenna(2 meter/transmit and 440 mhz/receive). For a more detailed breakdown of the operating aspects of LEO Amsat birds(including avail. freqs.,passes,and Doppler shift) please visit YT user K7AGE....or (Google)Amsat (Emily's primer for new users).

Jakob Huels-Elliott: He also had a love for pigeons :P Creepy guy.

SoloTotoCoyote: Cool......... although there's probably some poor guy in her apartment building wondering why his TV reception has suddenly gone bonkers. =D

Gutpile Charlie: Very good video, very informative.

rooftoptile04: FREE ENERGY MAN! FIGHT THE POWER!

Sorebonz: NIce. Particularly interesting demostration of the physics associated with a yagi. Very helpful, as I am a visual learner. .

mrfnk: @jedichad , you was going to say? you did say...

ericbwertz: @lehman I *think* that Eng/Ng is the Cantonese equivalent of the Mandarin "Ying"
Rating:
Directional Antennas 4.8 out of 5

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Directional Antennas