Resonant Magnet-Field Antennas Pt.1: Introduction
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- เผยแพร่เมื่อ 15 เม.ย. 2016
- A new video-series about resonant magnetic antennas in search of the „perfect“ AM-antenna.
Support Roger on Patreon: / kainkalabs
Magnetic antennas have many advantages over rod- oder dipole-antennas especially for indoor-use.
Everything explained from scratch: From LC-resonant tank circuits to resonant frequency to bandwidth, q-factor and damping-factor to skin-effect, proximity-effect and the use of litz-wire, solid copper-wire and copper-tubing.
Many different magnetic antennas are presented, discussed and measured: ferrite-rod-antennas, spider-web-antennas, loop-antennas, frame-antennas etc.
AM-reception is not only the radio-bands (Medium-Wave, Long-Wave & Short-Wave) but there are also interesting signals outside of the classical radio-bands (Time-signal stations, Schumann-resonances, submarine-communication etc.)
Further Links:
"DipIt" Digital Grid-Dip-Meter: www.qrp-shop.biz/epages/qrp-s...
German description with some downloadable files: www.qrpproject.de/dipit.htm
Forum: forum.kainkalabs.com/forumdis...
Shop: www.ak-modul-bus.de/
twitter: / kainkalabs
facebook: / kainkalabs - วิทยาศาสตร์และเทคโนโลยี
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Informative video - thanks
btw, Australia has AM stations broadcasting at 1701kHz
But not many radio had over 1700 KHz ?
As far as I know there are exactly two licensed stations on 1710 KHz in the US, both low-power "travelers information" stations.
These videos are exceptionally well made. More people need to see this.
Excellent! Very good explanation. Thanks! Now on to part 2...
We had once a jam session with a 24-channel mixing desk (completely populated with instruments and mics and stuff) going into a pair of active speakers. Then after a few hours of jam, the power cord of the mixer slipped out and even with the mixer powered completely off, all the loops of cable somehow formed an antenna - there was loud and clear AM radio on the active speakers... most people found that a bit scary but i was really impressed ;)
Seen this also...
Brilliant! I’m an uneducated novice, yet managed to follow every point in your video presentation. Somehow you managed to mix exactly the right blend of science and common sense. I’m a subscriber now that I ran across your channel.
Such a beautiful channel with very precious content and not a lot of subscribers, what a shame! Thanks for all the work you did here
@KainkaLabs Roger, thank you for these videos. This really helped me understand radio at a deeper level than I got from my Tecnician license books. I noticed you haven't posted in a couple years. Hope all is well. 73.
This is a great video! Thanks for explaining everything so nicely.
Your the man!! You sound proud to be sharing this information.
Wonderful explanation. Speaking slowly helped me to understand the subject clearly. Thank you for such an informative video.
Just excellent in all respect. Your slower speech delivery helped.
most useful video on the web! thank you, i've seen it from start to finish
Top! Genau das, was ich gesucht habe.
I thoroughly enjoyed this video and all your videos. Very, very good. Thank you!
I really like your description of inductor antenna circuits
Excellent video, thank you !
Excellent and very informative. Thank you very much!!
Great video! 👍👍
Missing sending a hug to marciorainer from brazil😀😀😀
Thank you!!
Thank u sir
Good lesson
Danke schoen.
Cool.
I'am watching your utube video on my cellphone
Should be a required lesson for anyone interested in radio, especially home builders. Resources for some of these parts and tools would be appreciated.
The resources are in our online-shop at www.ak-modul-bus.de
It is best to use in anti submarine and it could be used in antenna need no tower if correctly apply but also use in light interference in encrypted signal the same way in uv and ir
I subscribed kaon kala labs
Should I buy the apparatus on which the coil is wound or should I produce it with 3D printing?
The coil is wound manually. There is no machine to wind a coil for this type of coil.
Very useful sir. How could I receive Signal FM in AM radio
Frequency-Modulation (FM) is not used by AM-Radio Stations (AM=Amplitude Modulation).
Demodulating FM is a whole different topic.
There were numerous ways invented to demodulate FM over the decades.
Wikipedia is your friend.
Now I can put a face to the name LoL... You remind me of the skipper from the t.v.show Gilligan's island...
Sehr klar wie immer, aber der Link zu dem HF dip meter ist nicht sichtbar. Wo kann man dieses Produkt bekommen.
HF Dip-Meteris not available any more because the shop has closed :-(
Sehr kkar!
Good Job!!
I am working on a research paper trying to design a metal detector that can detect a quarter size coin three meters deep. Any Ideas? Your help is valuable
Good luck with that. Commercial metal detectors can detect a coin one meter in the ground. But 3 meters???
@@KainkaLabs Thanks for your reply.
1- Why should the 3m be that difficult?
Look at the specs for commecial metal detectors.
What is the exact model number of the "V CAP 4" variable capacitor ? Can't find it unfortunately.
Model. no? In our shop it is the VCAP4.
@@KainkaLabs can I order it to India ?
Yes, but minimum order value is 15 Euros net and shipping costs are 10 Euros for small packages, 30 Euros for lage packages.
@@KainkaLabs I understand. Thank you for the information.
Hi ....what mean Q factor...please i want know about it 🙂
Watch the other parts of the video series! This was only part 1.
You know Google translate will automatically translate that Federpendel (Spiral pendulum) Wikipedia page to any language you like. All you have to do is open it in the Chrome browser.
The Ebglish Wikipedia gives "Spring pendulum" as the corresponding entry for "Federpendel" und does not have an entry with "Spiral pendulum"
Sadly the dip meter link does not work.
Try this one: www.qrp-shop.biz/epages/qrp-shop.sf/en_GB/?ViewObjectPath=%2FShops%2Fqrp-shop%2FCategories%2F%22DL-QRP-AG%20Baus%C3%A4tze%22%2FDipIt
So thats the reason these tunneldiode made good amplification because they made the resistance lower, of the resonant lc???
Do you mean that tunnel-diodes were used as rectifier/demodulator-diodes?
@@KainkaLabs yes, demodulating germanium diodes. I still have some lying around. Will use them for some syntheziser projects.
Germanium diodes are _not_ tunnel-diodes (=Esaki diode)
en.wikipedia.org/wiki/Tunnel_diode
Germanium diodes have the same shape of the characteristic curve as silicon diodes, Schottky diodes etc.
AM is still viable!
In Germany all stations were forced to shut down by law to save money for what is called the "digital dividend". Nevertheless there are a lot of other European stations that are receivable between dusk and dawn. But during daylight there is mostly silence on AM in Germany.
extremely unclear ! In Engish there is no such thing as a "Magnetic Antenna" .
The 3xplanation is fine for an inductor conected to a capacitor .
Magnetic Antenna = Magnetic Field Antenna (in contrast to electric field antennas like dipole-antennas etc.)
Inductor connected to an antenna is a tank-circuit aks tuned circuit aka LC-circuit.
A magnetic antenna can be a part of a tank-circuit, but does not necessarily have to be a part of it.
KainkaLabs is referring to a coil & ferrite rod combination as a "magnetic loop antenna," which is technically accurate since anytime you pass a current (radio signal) through a coil of wire, a magnetic field is generated. Maybe you were looking for a video about an active HF loop antenna, this is not about those, but there are plenty about those on YT. BTW I've watched 100s of videos on RF antenna concepts & demonstrations and this one is the definitely the best so far.
False info.
Thats a loop INDUCTOR, not an antenna.
The current thru it changes smoothly, therefore there is no antenna ' radiation' ,(also an incorrect term).
More lies myths and fairy tales to make a Clickbait video