Antennas 101 / How does an antenna work
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- čas přidán 9. 02. 2017
- This video is a tutorial that will describe how antennas work and the properties of different configurations. The common Dipole and 1/4 wave Monopole will be covered. Instructions on how to build your own Monopole WiFi antenna will be presented.
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Underrated video! I'm a ham and I wish I had viewed this video when I first started. Thanks for explaining antennas in such an easy way to understand. Keep them coming.
N2FLA...
Agreed. 6 years later, still underrated. It's not exactly a master-class, but it hits the important pieces for getting 90% there, which is better than watching a master-class for hours, missing most of the concepts, and trying to apply them to get a workable antenna. One formula, and a simple modable design.
I know this is an older video but SO HELPFUL. Super informative, easy to understand, not long winded...and amazing use of a bagel to explain a concept! Thank you so much - loved it!
You are so welcome! Thanks for the feedback.
I got my FCC First Class RT Operator license in 1980, but antennas were always a weak point for me. This video bought a lot back, and made a lot clear to me. Nicely done, sir.
Thanks for the feedback ... glad it helped!
Excellent description of the EM field generated by the monopole and dipole, as well as gain antennas! Great use of visual aids!
Using a bagel to describe a radiation pattern is super clever.
bagelectrical 101
Very Large Bagel 👍😆
Now I know why pigs love ham radios! Think of all those calories!!! S#1t!
reverse thrust very good question, he probably likes ham radio too.
He certainly used his loaf ;)
I became clear to the concept of impedance matching after watching this video after listening to the word almost for 6 years without any logic. Wow dude... you did great.
I just learned more about antennas watching this video, than I did the last couple of years reading forum posts on it... Excellent may I say
Please make more antenna videos! You just explained to me in 8 freakin minutes what no one else has explained to me in 20 years of casual investigation. PHYSICAL demonstrations of the antenna wiring beat every damn virtual/whiteboard drawing EVERY DAY.
THANK YOU SIR! I finally actually understand WTF a dipole antenna actually is, in real life...
Oh, and YEAH, what the ground plane stuff is for also!!!!
73, KD2OQN
Glad I could help.
@@0033mer how did you learn this when many of us have struggled for years trying to get our heads wrapped around how an antenna functions?
90 seconds into the video, I already loved the donnut or bagel analogy ! Thanks !
Thanks for posting. Very clear explanation. Easy to understand even for a non-native speaker like myself.
Wow, what a fine, clear, imaginative presentation! Best I've seen. You are a gifted teacher!
Thanks for the feedback!
Thank you for this informational video! I’m just getting started in Radio Astronomy, but don’t know much about antennas, but this video certainly helps =)
I've watched many videos over time, read books, but have never understood my CB antenna(s), I'm not stupid, I just never found one that made sense, so I was happy to follow the rule that as long as I could get the SWR below 1.5 by adjusting the length of the 'top' part, it was good!.
This video made some sense, it helped me understand concepts I wasn't sure about. The way the power is radiated, how and why the cable can be as long as the aerial, but that it's the shield that reflects the power from the center back into itself, split the two, go opersite ways and you've got less reflection, split the shield part further and you get a ground plane, So simple it actually made sense rather than the drawing in books of a upside down triangle!
My D-Pole was the best by far, 10mls, and when there was 'skip' I got to chat to people in other countries! But, OMG! I actually have some understanding now!
Seriously, this is like the basic 101 that I needed to kick my ass into gear in to wanting to learn and understand this topic rather than just getting the lowest SWR, I hope now to be able to look for another video or wait for you to produce one which can explain CB antennas, base loaded, mag mount vs through hole grounded, you really did a amazing video there... not too much maths, just enough to help... Thank you soooooo much!
Antenna theory is one of the most interesting 'mystery sciences' there is. They just don't work according to 'normal' electrical theory and many people just don't understand that.
Great explanation on Dipole antennas and the formula are really pertinent. Thanks!!
This Video REALLY Helped Me To Understand HOW Antennas Work.
You did a great job w this video. Very straight forward and clean explain w a nice practice build
Bloody awesome video mate, explained some of the concepts I thought I knew but became so much clearer after watching this, thank you.
Thanks for the feedback ... glad that it helped.
That is a very well presented video tutorial. A lot crammed in and every bit relevant. Great work
This is a gold mine find. Dude. You explained it better than anyone! Are you gonna make more videos where you go into how this also related to antenna math?
Brilliant...! Thanx for making this video, it has cleared up a number of things for me about making antennas...and the VSWR too! :)
Hell yes! Your vids and explanations are the best.
A really good absolute-beginners antenna video.
Thank you for an amazingly informative and concise video...so much learned in so short a time!...JR Bristol..UK
This video didn't prepare me for tomorrow's test, but made me crave a bagel since I never had one. That thing looks tasty
I couldn't imagine that someone had never had a bagel before.
Get yourself a Bagel and pickup some real butter and Philly cream cheese, too. Mmmm...
Yall Take Care and be safe, John
@@JohnDoe-pv2iu I really would, if I had access to them. Sadly there's very few places that sell them and they're all just bagel shaped bread
Well explained. Demo much easier to understand than other videos. Good job
Glad it was helpful!
Brilliantly explained sir, just superb. Greetings from Wales (no call sign yet... hopefully in two weeks if I pass) 👍
Thanks for the feedback and good luck with your test!
Many thanks. Can I suggest a video project for you (and for me to copy haha!)... any chance you might be able to do a project that constructs an SWR meter using the Arduino? I am certain this would be hugely popular!
I have built VSWR alarms for repeater systems using a Motorola directional coupler and a microcontroller.
The directional couplers are expensive and tricky if you want to build one yourself.
I would invest in a Bird 43 and learn how to use it properly ... very powerful tool.
Thank you. Very well explained. Especially that you bend the radials to 45 degrees to match the 50 Ohm impedance --- now I get it. Thank you :)
You're welcome. If you want to see that type of antenna on an analyzer check out this video:
czcams.com/video/wR-2c8VgunI/video.html Thanks for the visit.
Great video, thank you for putting it together!
Also you have something to eat at the end of the vid! What a great informative vid.
Excellent presentation. Easily understood. Thanks
Pretty good simplified explanation.
“We’re not creating power, we’re focusing the power”
Love your video thanks you got a new subscriber keep them coming
Excellent explanation!!! Thank You!
Excellent explanation! Thanks!
I know this is five years late, but that was the best video presentation of antenna pract app. You sir, should write a book, (failing that, at least more videos) expeditiously. Thanks for sharing. KC3UEE
You're welcome! Thanks for the feedback.
Hello Sir - very nice demonstration and explanation. Just one slight correction I would humbly offer: around 2:40 you refer to maximum power transfer from a stereo amplifier to a loudspeaker. This may be the case in vacuum tube designs but in most solid state designs the amplifier is made to behave as a voltage source, and usually has an equivalent output impedance of milliohms. The designation of 4 or 8 ohms you may see on the speaker terminals of an audio amplifier relates to the design limits of the output stage and to the current and voltage capability of the amplifier to deliver its rated power to a load of a given impedance before either running out of current or voltage. Therefore, it does not exactly relate to the typical RF power amplifier or signal generator, where the output impedance is matched to the rated load impedance for maximum power transfer.
Thanks for the response.Yes .. In a vacuum tube amplifier the tubes drive a impedance matching transformer so the speaker load is important for maximum power transfer. These are the days I remember. Solid state class A/B amplifiers are more flexible about speaker impedance and we match more for distortion than power transfer. With the new class D power amplifiers however the output low pass filter needs to see a proper speaker load for power and frequency response. For someone who is new to antenna operation I simply used the stereo speaker output example as something they can relate to.
Great vid. Gonna try to build a monopole tomorrow.
Really nice video for complete beginners like myself!
You know what I just liked your video and subscribed you. Thank you.
AWE - Video ended too soon :( I was learning so much. --- More videos like this please :D
Check out this video on antenna construction:
czcams.com/video/JeUexihrKZQ/video.html
thank you :)
Thanks for making this video.
This is pure gold.
Really interesting info. Thank you for passing it on. Definitely will [subscribe] for more possible tidbits of radio-wisdom :) Thank you again!
I haven't a clue what you were talking about but it was a well informed clip 👍🏾👍👍🏽
Check out the description box for more instructional videos.
Great description with the bagel.
Glad you liked it!
👍 nice presentation, I like the demonstration using the Donat. But seriously, I like the practical views on how to create a simple antenna.
Glad it was helpful!
You are brilliant! Thanks for the video!
Your welcome!
Absolutely brilliant video.
Thanks for the feedback ..
You're welcome. You really are doing a service in sharing this information.
Thanks for the video 👍
Learning about antennas, also never had a bagel but those look nice
Excellent explanation for newbies (like me)!
Glad it was helpful!
great help thanks😀
Great video. 👍
Ughhh , like i was back in high school! Very informative
Love the bagel btw
Good demo
excellent! Thank you very much
You are welcome!
Great video. Thank you..
You're welcome.
Thanks, i will try to make this kind of antenna for my helium miner
Great video!
Glad you enjoyed it
Very useful information
Thanks for sharing! 👍Good Stuff
You're welcome!
Love that volume
I'm a rf engineer and worked on antenna in the past. Typically when you make an dipole or monopole antenna, you should connect your antenna to a VNA and check your return loss(s11), and make sure it is tuned to the right frequency. The actual size of the antenna is shorter than the calculated value because of fringing effect.
The antenna was trimmed using an Anritsu S412E for best return loss. Fringe fields only apply to Microstrip/Patch antennas. With a wire monopole the Velocity factor (Vf) has to be taken in consideration for proper antenna size. The velocity factor is already taken care of in the formula for constructing the radiator and ground plane radials.
@@0033mer rotflmao ,,,,,, You The Man!!!!!! ,,,,,, I've been reading some of the replies,,,, some of these folks need to check themselves before attempting to check you,,, Thank you for taking them back to school! it's been confirmed, you that guy !!!!!
assembled a TV antenna tonight, now I'm here to know how it works
Great videos , informative.
Im not so good at electronics and need some help.
I have a Sony AIR-7 Scanner radio with Air ,PSB
Great video
Thanks!
You are so smart. I can remember now because the signal is spread in the pattern of a bagel.:-)
Plz answer my questions ASAP. I want to know do there is a antenna tht very tiny something like 10^(-3) m, with very narrow beam reaching inosphere. beam so narrow tht it rarely expand when reaches inosphere giving pure one to one connection.
Explanation was the best and easiest. By now i have this doubt.
great video..
Thanks for the visit
Aspite some very negative comments i concider this video very informative and well explained! The impedance matching is very important, also the SWR measurement. A NanoVNA ist probably the best and quite inexpensive tool to tune an antenna. Why is a dipole antenna 37 ohm? Is this true for all frequencies and idenpendent from heigt and form/surroundings of the antenna?
Thanks for the video. Why 234 vice the 300 for c that they teach in the books? it is clear to see that 234 used in the equations works well. Thanks again for the video and for your time.
That was really interesting. One point; the radial wires did not look like they where are 45 degrees. More like 30 degrees. I guess you could tune the wires if you have a signal strength meter. Perhaps a smart phone with a WiFi app that shows signal strength. That might make an interesting video. Thanks, I'm enjoying these videos. Short, simple, clear and no frills.
Good observation .. I built a few of these antennas with different radial angles and I happened to use that one in the video.
You are correct, the best way to fine tune the antenna is with a field strength meter and play with the angles.
You could even cut the radiator longer to start with and trim off a little bit at a time for a peak in RSSI .
Robert Shaver
Oh great... another number that I got to remember... 377. However, this is a great video!!!!
Thanks.
AMAZING. THANKSS
You're welcome!
I tried putting bagels on my antennas and got less power. Will doughnuts improve my transmission or reception? Are crescents any good?
Thanks a lot.
You're welcome!
Hi, I want to make an external quarter wave ground plane antenna, mainly to monitor frequencies 118.000 MHz to 136.975 MHz (aircraft band). As far as the 3mm welding rod is concern, is bronze better than aluminum? Also, when using the antenna calculator to determine the length of the radiating element and radial elements, what frequency will I input in the calculator and will I retain the 0.95 velocity factor?
Nice job. According to the formula we see towards the end of the video, when we calculate low frequencies, the wire sizes are quite long. For example; 2832 inch for 1Mhz frequency. An impossible length. Is there a way to shorten the wire sizes?
Low frequency = long antennas. Search online for long wire antennas with balun or antenna tuner.
Hey, I have been watching every single possible video on antenna tuners that I can find in order to understand everything I can about this devices, I have a modem receiver that have this single wire antennas that come with a ATU unit "Two of them" each have a this totally miniaturized version of it.. but range on this particular unit really stinks. Now its my hope to increase the range by installing a good set of choked dipoles but don't know if I have not other choice but to use the same type of ATU? with the same value on the capacitors & inductor....your advice will mean the world to me!!
Start out simple. Go through the instruction manual that came with your tuner.
Feed your single wire antenna into the tuner. Make sure you have a good ground ... very important.
The impedance of the single wire will be high so the tuner matches it to the 50 ohm radio connection.
Use an antenna analyzer during tuning to get a low VSWR which will verify the match.
Get in contact with your local Ham club if you need more help.
Check out this video that describes a very simple setup:
czcams.com/video/o43sAF4HwJs/video.html
I'm very grateful for your advance, thank you very much.. but what I was really asking was.. since the one wire are already tuned by the manufacturer.. and have such a short range would I have to use exactly the same tuning circuit when I connect it to a dipole? ore will I have to use a different circuit....or slightly different... ?
A Dipole is a resonant antenna so you need to cut its length to 1/2 wavelength at the desired operating frequency.
Use a SWR antenna analyzer to find the resonant frequency and fine tune it so you can feed it directly into your radio.
If you do not have any test equipment feed it to your same tuning circuit and then your radio.
Yup, I do have the means to make my own custom antennas and I will be using probably a 1/4 wave, my true problem is my ignorance of that if I remove the tuning circuit... I may literally destroy my receiver.. "Since been a modem there is some data exchange... goes in both direction" that is what is digging a hole in my head, that is the reason I'm trying to find a few fellow amateur radio friends that can guide and help me, thank you very much from Daytona beach KN4GCQ
Good video
Thanks for the visit
Thanks!
Welcome!
5:10 the input impedance will change of you bend the exposed parts to the black (like 120-130 degrees), more like 50 Ω then
Cool show I like it
I'm glad you like it
0:35 That's what she said, "You're vertically polarized"! Bagel?
N Connecters are use for both 1200 Mhz and 2400 Mhz Antenna,
спасибо
Can you use a raisin bagel ?
Nice tutuorial but would have been better if he had actually hooked it up to a radio and
a meter to demonstrate the actual values he was explaining . I did this very stunt back
in 1972 when I came back stateside and boughty my first CB radio. I worked with guys
who were antenna specialist in AF and we used to play with antenna designs to see
if it was possible to take old military antenna and addapt them to Civilian usage for fun.
Some interesting experements and drove the FCC crazy at times.
now I'm hungry, i want a bagel ...
me too! now to google "bagel fillings" ... I'll get back to my wifi later.
What would be the purpose of a 5 director, powered yagi antenna on an easement? I.e. maintained by county? It's approximately 10' off the ground about 1/4 mile from a cell tower
Badass!
This question has probably been answered already. And if it has i apologize. My question is what is the purpose of a capacitor being installed on the inside of a flexible antenna?
If this seems to be a stupid question i apologize. I'm not stupid but I'm definitely not a genius either. I absolutely love trying to figure out how things work. I love to find things that don't work and see if i can figure out what is wrong with it then see if I can fix it.
Do you have a link to buy the chassis mount female connector?
Check out Digi-key, they carry the whole range of RF connectors.
www.digikey.ca/product-detail/en/amphenol-rf/82-97-RFX/ARFX1023-ND/21820
Wait a dang minute. Did your bagel just identify as a donut?? What had this world come to???
Thanks
You're welcome.
hi what about the antenna with around?