Making a VLF antenna for the 2 KHz-10 KHz band and tune it in/test (old video 2008)

Рет қаралды 17,275

7 жыл бұрын

I had a question to show how how to make a VLF antenna. This is an old video from 2008 (or so) in which I explained that. I also show how to get insight on the resonance frequency. Less turns and/or lower parallel cap =higher VLF frequency. More turns and/or higher value parallel cap = lower VLF frequency. It has to be tested on its resonance on frequencies between say 1000 Hz and 30 KHz, see video. You can use a small variable sine wave generator. The antenna is, by the way, a loop antenna, that means that the frequency band is (by its nature) small. So with a few parallel caps in the 500 P up to 10 N range you can get to all kinds of VLF frequencies.
All the videos hat I have published on You Tube can be found via my Channel Trailer: Link is
• Radiofun232 on KZfaq...
In thematical order you can find these video’s under the “comments” section. My books about electronics are available via the website from “Lulu”, search for author “Ko Tilman” there.
My books are also available via Barnes and Noble and via Amazon. Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on KZfaq. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you cannot be sure about the original content (=really working electronics) and important adaptations to the circuits.
More relevant video's about VLF (update 2 March 2024):
VLF antenna for 4-5 KC (made 2008 or 2017) how to make an antenna for that freq. band on a frame of wood or PVC
• Making a VLF antenna f...
VLF Storm and lightning radio receiver (1 KC-30 KC) 18 sep 2019 (schematic of a two transistor LF amplifier)
• Storm lightning and je...
VLF receiver 2 transistor updated and revisited schematic (18 sep 2019). In essence the same as the circuit linked to above
• Storm lightning and je...
VLF receiver overview & test (looking at lightning its extreme electromagnetic waves in the VLF spectrum) 29 Nov 2021
• VLF receiver 1 KHz - 1...
In the textbox of that vid you see these links to all the earlier VLF Video’s
Video link 1920 AM radio with triode • 1 tube AM radio circui...
VLF radio part 1 • VLF receiver 1 KHz-10 ...
VLF radio video 2 • VLF receiver 1 KHz -10...
VLF radio part 3 • VLF receiver 1 KHz - 1...
VLF radio part 4 • VLF receiver 1 KHz - 1...

Пікірлер: 24

@sssdeecee 2 ай бұрын

Thank you for this video. Another use for VLF of 2 - 10 KHz is to pick up solar wind interactions with the Earth's magnetosphere... aka auroras. Since we are going into solar max (2024-2025), this kind of antenna, combined with an inexpensive SDR could be the start of a fun hobby for some. :)

@asfarasyoucango 7 жыл бұрын

Fascinating stuff this vlf, hope you do more vids on this kind of thing, just love the way you build things, and the experimental approach.

@radiofun232 7 жыл бұрын

Thanks, here you see how a lightning strike has an effect on VLF kzfaq.info/get/bejne/Y59dp8Slr7GmgYU.html

@memeconnect4489 4 жыл бұрын

what ever you do, don't ever stop uploading , !! This video is VERY valued for me , Thanks for uploading this

@radiofun232 4 жыл бұрын

Thanks, good to hear that, gives me inspiration.

@memeconnect4489 4 жыл бұрын

@@radiofun232 you are a inspiration itself your videos are amazing , I'm not sure if you know the app Discord but a dude named signalseverywhere have a discord group and im sure you could contribute a lot in there and help some young people :)

@radiofun232 4 жыл бұрын

@@memeconnect4489 OK, thanks.

@sourcesource8750 5 жыл бұрын

I am planning to build this, I think you can use PC sound card to see Spectrum

@memeconnect4489 4 жыл бұрын

how did it go please report back :D

@ahmetozdemir7173 4 жыл бұрын

Nice video. I want to ask something: I want to make a no-omnidirectional antenna from 1khz to 300khz. In the videos I have seen the most, the omnidirectional antennas in this band can be made small and useful. For example, the mini vip antenna ... But the one way directional antenna I want. is the antenna directional? you use in the project Can I make a hand-held directional antenna in the frequency range I gave above?

@radiofun232 4 жыл бұрын

Yes, when you use a ferrite rod of (say) 20 cm and wind your coil on it. Windings can be calculated or found out experimental. 1 KHZ is very low, compared to 300 KHZ. I mean: say you need a parallel capacitor in the 4N-10N range (given say a few hundred windings) to get to 1 KHZ, but to get to 300 KHZ you need (say) 100 or 180 windings and a variable capacitor of 1000 pF (at least: when you want to tune in on a specific frequency). Variable capacitors of 10 N do not exist, but it is possible to move the ferrite rod in-out to tune in on such a low frequency/frequency band. A ferrite rod antenna acts on the magnetic component of the radio signal, by moving it in a horizontal way it is direction-sensitive to a horizontal electromagnetic (radio signal) field.

@ahmetozdemir7173 4 жыл бұрын

@@radiofun232 Thanks very much. it was very helpfull.

@radiofun232 4 жыл бұрын

@@ahmetozdemir7173 OK, thanks. Here you see how you can tune in to a radio station or frequency via the ferrite rod kzfaq.info/get/bejne/j9N3h5yHprXYqmw.html

@alexandermozeika4174 3 жыл бұрын

I am trying to follow this design to build my own VLF antenna but wonder if it can be also used for transmission of VLF signals?

@radiofun232 3 жыл бұрын

Yes, when the coil is connected to an oscillator that is able to work on the frequency of the coil (VLF).

@alexandermozeika4174 3 жыл бұрын

@@radiofun232 I have this car "1000 Watt" amplifier lying around, so thinking of using with this antenna and oscillator.

@radiofun232 3 жыл бұрын

@@alexandermozeika4174 I wish you success. But why and how do you want to make a VLF transmitter of 1000 Watt with that car amplifier?

@alexandermozeika4174 3 жыл бұрын

@@radiofun232 Connecting antenna, with a capacitor connected in parallel, to the output of amplifier and connecting oscillator, supplying resonant frequency, to the input. Since I am building this antenna for receiving anyway, I thought it would be interesting to test how transmitting will work, but I am not expecting any magic here - antennas of VLF transmitters are massive for a good reason I guess.

@radiofun232 3 жыл бұрын

@@alexandermozeika4174 yes, OK, thanks for your reaction.

@variousexperiences6485 7 жыл бұрын

that s good ...but the capacitor kind is polyster of ceramic one

@radiofun232 7 жыл бұрын

Does not matter, because it is all on low frequencies. You can try the 2 types and test it.

@variousexperiences6485 7 жыл бұрын

radiofun232 ok Thanks i ll try that

@Dannydawson537 4 жыл бұрын

Hi sir great vid and nicely presented i have some further questions for you regarding making a antenna and a pre amplifier do you have a email address please

@radiofun232 4 жыл бұрын

radiofun232@gmail.com