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Good Question. It is widely known that wider gauge conductors have lower inductance per unit length. My opinion is that a wider conductor means more magnetic work involved to create the rotating magnetic field around the conductor & inductance is "magnetic inductance". I haven't stumbled upon any relevant physics to explain it but it may well be out there. I apologise for the poor video quality too 🙏

@@crazyhamit is great one actually and what you are saying makes perfect sense. I couldn’t find clear thoughts about this phenomenon. I heard that the inductance is a measure of how efficient is the wire to produce magnetic field lines (i.e. magnetic flux). Since L= flux / current, either the flux reduces or the current increases. I tend to say the flux reduces do to smaller cross-sections area between the wire and ground where the flux penetrates? Just thought

Yes, interesting thoughts. Also the capacitance with the surroundings reduces with a narrower conductor and increases with a wider conductor. This would hold true for a single wire or one of a pair too. Thanks so much for your comments my friend. ⚡🙏⚡

No, it definately wasn't from my TV but thanks for taking a guess 🙏

Hi my friend. It was part of a series of videos. There is 3 or more videos I think. The first video is linked below. The first version only used one led panel. (Rectification used is just 2 x 1N60P germanian diodes per section in a push pull from the Torus's to the DC figure 8 cable.) Inductors are approx 12 turns (bifilar) on L15 toroids adjusting the inductance to find resonance using pernanent magnets. (Tricky). th-cam.com/video/wHNAYpwkYik/w-d-xo.htmlsi=_oqFDbHPTPGyqXsd

I have only tested it at HF, VHF & UHF. The antennas alone would make it problematic at GHz range & I am unsure if the diodes are fast enough too. It works very Well across HF Bands, VHF & UHF for sure my Friend. Thanks for the Question ⚡🙏⚡ (Antenna lengths are critical for VHF and UHF as mentioned in the Video)

​@@crazyhamI bought an rf meter, but it can only detect waves from 50hz to 3.5ghz, I have a hair dryer that emits very strong rf radiation but I can't measure it,How can I measure and remove them?

i can be sure the device emits very strong RF waves but the 50hz to 3.5ghz measuring device cant sense it, maybe at ehf shf frequencies, how can i get a device to sense them

I can say for sure that DC motor hair dryers emit RF waves, but I can't get a device to measure it.

Great questions my friend. The Hairdryer will be emitting significant RF waves on a number of really low frequencies. If too low in frequency, my meter isn't sensitive enough. Really low frequencies have really really long wavelengths, *So small antennas are less effective on really long wavelengths.* This meter & perhaps yours too and many others will pick up things like LED drivers etc as they also emit a lot of low frequencies but much higher in frequency compared to the hairdryer (assuming no fancy circuits). U could always use an oscilloscope, set to the range you are interested in and attach wires to the probes as an antenna system and see the different frequencies and how strong or weak they measure etc. Even a fairly cheap pocket oscilloscope would be ideal. It's what I would do in your situation & if you haven't used an oscilloscope it will be a great and useful learning curve too ⚡🙏⚡

Yes, You can place a potentiometer between the Positive side that connects to the meters positive terminal. (100K OHm or higher). If you look up my latest video on how to build an led rf meter it shows how to connect the potentiometer. It has a similar circuit except for the LED Board & an On Off Switch. Link Below: th-cam.com/video/hJHk-zmoFBk/w-d-xo.htmlsi=ap_3iDpobd3kcKon

Hi my friend & thanks for your comment. You can connect a potentiometer between either the positive or the negative DC side that leads to the meter terminal. Example, interrupt the connection to the positive terminal of the meter with a potentiometer. I suggest approx 100K ohm Potentiometer. I suspect the 1N34A diodes would give a similar result but I suspect that a genuine 1N60P germanium diode might be a tad more efficient at higher frequencies but I am not 100% sure. Be careful as there are plenty of fake 1N60P diodes for sale that are really Silicon diodes. (You can also leave out the inductor if you want as it is a little bit of overkill. It was to ensure that the system only worked as a dipole. It will still be sensitive and useful without the inductor.) Let me know how you go with the project mate & 73 from Australia 🇦🇺

PS: Take a look at my latest video on how to build a sensitive LED RF field strength meter : th-cam.com/video/hJHk-zmoFBk/w-d-xo.htmlsi=5bHeZJGtLodY2gSA

@@crazyham Finished building and testing -works great! I didn't need to use the 100k pot, and the 1N34A germanium diodes seems to work well. I used it as a "show and tell" at our local ham meeting today and the response from the members was loaded with questions! I referred them to your You Tube website, but I had to take the back of the box apart to show them the actual components. Our president was fascinated using his HT at various positions and angles and viewing the results. I used a large 100 micro amp meter, the 4 IN34A germanium diodes, a plastic box, and parts of "rabbit ear" TV antenna. Aprox $27 Thanks for giving the world a great, easy project! 73 Don

I'm so pleased that you had a great success with the project Don. That is awesome the club members were very interested too. I really appreciate you coming back to share your outcome too. Maybe you can build the next one for show and tell at the Club too? it is an LED rf meter. It is my latest video on TH-cam. Thanks again Don. 73 de VK3VKe (Epoch) ⚡🙏⚡

Thank You 🙏 I am still working on sorting everything out. It has been a mission lol but I can see the light at the end of the tunnel now 😁

Thanks Mate 🙏 73 from Victoria Australia 🇦🇺

Ok, I understand your question. No, this device will not find metal. It can only detect radio signals coming from an antenna system. I think there are a number of videos on youtube showing different ways to make a metal detector. Thanks for your question & I hope you find the info that you need my friend 🙏

​@@crazyhamThanks for your explanation, Professor, also include a metal detector on the TH-cam channel

Thanks Mate. Maybe that is something I can consider in the future. My channel is mostly related to radio (Amateur Radio) but I do think that would be a very interesting topic to cover. Thanks so much for your feedback & best wished from Crazy Ham in Australia ⚡🇦🇺⚡

Hopefully this link can help you start to experiment but I will look deeper into this and perhaps do a video in the months ahead on the subject. www.wikihow.com/Build-a-Metal-Detector

​@@crazyhamcan i have your facebook

Hi mate, What is your question ?

Good Question, Unfortunately I haven't been experimenting much since this video. (Lifes distractions) I do hope it at least inspires others to experiment. I have dreamt up numerous variations of this concept since too. Thanks for your question ⚡🙏⚡

Yes, for 50 Hz AC. I have considered that. I haven't been experimenting for some time though due to lifes twists and turns. Great comment thankyou ⚡🙏⚡

Excellent my Friend 🙏 Good luck with the Exam & Welcome to the World of Amateur Radio ⚡🙏⚡ Let me know how you go with the project too. 73 from VK3VKe Crazy Ham 👌

Thanks my friend.😁 Let me know how you go too ⚡🙏⚡

Thanks So Much my Friend. Life had gotten in the way but I am still here. I hope you find the video of value. I am not very good at videos and to be honest this video took me all day to get close to right hahaha. 73 from Crazy Ham ⚡🙏⚡

@crazyham don't worry about anything we love what your doing

Thank you so much mate. I really appreciate that feedback ⚡🙏⚡

​@@michaellanders1601I do think it is cool that I am concerned it is too sensitive where more YT vids on how to build an RF meter are too insensitive lol.

Hi there. I recommend sending the signal to ground via a 50 OHm resistor when the switch is open. I done that after the video. Some of my function generators behave badly when shorted. (Dimming lights etc) Also when I left it floating instead of shunting to ground some of the rf still made it to the antenna so the morse was just changing magnitude instead of truly on and off. The scope probe was simply connected to the output side of the relay (essentially the coax shield and centre conductor after the switching .) I simply had the two output terminals linked straight to the output coax cable so I could either use a wire antenna directly or use a coax feed. You have to make sure you connect the relay correctly so you dont end up with the switch closed when the light is off and open when on. I recommend using a better function generator also. Thanks for your questions & I hope I managed to clarify what you wanted to know. (Additional info) I have since modified the system to be operated by a morse keyer for ps2 keyboard circuit that you would normally key the radio with using a keyboard and memories, all I had to do was connect the line that would key the transmitter to where the LDR photosensor switch connected to the relay circuit which replaces the light sensor to key the relay. If I can find a link to one, I will try add it in another comment.

I am currently unable to find a link, but the morse keyer I use is called Betatech Instruments K11-20 Keyboard Keyer. Though any similar unit would do that job too if u wanted to key it with a keyboard.

@@crazyham Thanks so much! I'm just getting back into amateur radio after a 10 year hiatus. This time I want to try and build my own equipment. I have an Owon handheld scope that I'll be using as the function generator. I think my first step once I get my dipole antenna setup will be to connect the function generator directly to the antenna and just start and stop it with the buttons on the scope to see if I'm getting a detectible signal on some local WebSDRs. Next my plan is to put a button inline with the antenna so I can drive it manually. Originally, I was just going to have it be a SPST switch and let the signal output float, but based on your feedback, I decided to buy a SPDT button so I can send it to ground through a 5W 50ohm resistor. And if that all works, I might try and build an amp and filter for it to see if I can get around 1-5W out of it. Should be fun either way though!

I'm so pleased you are getting back into ham radio mate 🙏 That sounds like a good plan. I have also experimented using a function generator into an inductor and adding an audio source across the inductor & tuning to resonance with an external magnet. I have managed to achieve both AM modulation & FM modulation but this was an elaborate inductor design. If you look back through my older videos there should be some on that topic. I love the experimental side of Amateur Radio personally but I am on hold at the moment as I am selling up to move north (warmer weather). 73 my friend de VK3VKe ⚡🙏⚡

I have recently purchased a cheap rf amp on ebay for 3MHz to 28 MHz that works great from just a function generator & it only cost me around $35 AUD assembled lol. It has a max output of 30 watt with an input of 3 watt max. Not bad for such a low cost. I bought it to see if it was ok. Using only a function generator as the source at 0.5 watt into the amp I have been hitting Western Australia (3,500 km away) with an S7 to S9 & in my next location I may set up a number of verticals all phased with a small amp at the base of each vertical DC powered via the coax using bias tees. It will be a fun challenge impedance matching at the source and at each vertical yet my trick using magnets on inductive cores makes that so much easier.

Yes, by all means you can ask me questions. You can either use the comments section or perhaps email me here : rock_da_cosmos@protonmail.com Essentially I am adjusting the inductance value of the magnetic core/ferrite material using an external magnetic field until I find a resonant state & I have managed to get hugely increased Q factors with this method but it is still debatable regarding the actual working of this. I hope to do further exploration of this concept when I settle in my new location next year. A ferrite core is a magnetic material yet any polarisation of the magnetic field is caused by the applied alternating currents. In my view, we can oscillate the orientation of the permanent magnetic field when brought to resonance allowing for a quicker pull back if you like causing at increase in the energy state. A more sudden change within a small space of time is an increase of energy. The none polarised core cannot achieve this alone even when at resonance. My experience suggests that the magnetic field produced by the windings has to be offset to the externally applied magnetic field in order to create a wobble of the net magnetic field that aligns in timing with the applied frequency. I hope that makes some sense.

That is a Fascinating Idea I admire your thinking. Would be worth experimenting with. Thanks so much for the Comment ⚡🙏⚡

This is a very old Video my friend. From memory I had an Air variable capacitor along with some tesla bifilar coils on ferrites being adjusted by permanent magnetic fields. The UHF Yagi elements were actually being used as an electrode for the active side to direct E field Lines of Potential away from the system. In the real world it turns out that the direction of propagation was actually opposite to the high E field State being demonstrated here . Much Potential with this to be worked on.

Thanks Mate. Do you have a suggestion for a Video Title for that one? I am a bit shy lol

@@crazyham Keep it simple - "LED RF Meter: How-to"

@@donnorris1954 Excellent, Thanks Mate ⚡🙏⚡

I am building up the confidence to create the next video. I have rebuilt the RF meter as a better build & plan to do a video soon 🙏

@@crazyham Great! I like that your videos are just you talking to us and showing things, not slick over-produced episodes. Just go for it.

Thanks Mate. ⚡🙏⚡

Thank You ⚡🙏⚡

Yes, absolutely. Or No added Cap is fine too. I have used as high as 1uF without too much lag though from experience there is no need for a cap at all.

Thank You my Friend 🙏🙏🙏

Hi there, I just ran a quick test for you. Although it will TX on 40 MHz the output is attenuated due to the internal filters dropping 25 watt down to approx 17 watt. I'm curious what 40 MHz is used for in your part of the world? 73 Mate ⚡🙏⚡

Answered my own question by paying attention to the teacher. . .🤣

Hi my Friend. I am sorry for delayed reply, I have been very busy here. This video will show more info on this subject ⚡🙏⚡ th-cam.com/video/ULz9VlNd2ko/w-d-xo.htmlsi=rhQ77A_0Hts7B8rT

Also, here is a Physics Professor explaining Currents vs Displacement Currents. th-cam.com/video/3sP9kh4xtKo/w-d-xo.htmlsi=dj9q4n414cuw1VMZ

Thanks for reply 😊

No Probs my friend ⚡🙏⚡ Yeah, the experimental antenna system I was using has a Magnetically Variable Transformer made of Bifilar Pancake Coils wound over a ferrite rod using externally applied magnetic fields to tune/vary the Inductance Value & in Turn the Dynamic Capacitance as a result ⚡🙏⚡

@@crazyham I had just ran across amazing concept.. Markov transformer it's bi directional an eliminates Lenz effect. I was looking for a transformer to step up voltage. From the radiant, though ya may have some intrest or ideas. Stepping up an rectify voltage an the amps on the radiant is how I came across your videos. Thanks again for all your hard work.

I'd also be interested if you had been able to increase the amperage? An forgot to mention Markov has a russian patent for his transformer.

Unfortunately I didn't continue with these experiments due to life etc but I do hope to continue with many experiments when I settle in my new home eventually. (I have been working on preparing to sell my home & have been further delayed with a local storm event that caused lots of damage to my Property ⚡🙏⚡ ) Keep Smiling my Friend & Happy Experimenting ⚡🙏⚡

That is excellent my friend. I'm happy to hear you are going to start your own research in this field 🙏 Master Ivo has some great videos on his channel, He is awesome ⚡🙏⚡

Yes, Absolutely. Half of the Vpp is always across the two windings acting as a dynamic capacitor & inductor 👌👌👌

Thanks So Much My Friend. Yes, we do have some pretty huge tall trees here that's for sure. This was the worst storm many have seen in my area at least in the last 20 years. It was Short Lived hut very Severe. I'm still planning to sort everything out to sell and relocate but might end up staying an extra winter here in Emerald now. Stay Safe & Well up there in Arizona mate 👌 Cheerz & 73 from Crazy Ham ⚡🙏⚡

I'm sorry, I don't understand your Question ?

I have an idea of what they're saying, " how is it working without any electricity?" ​@@crazyham

Thank You 🙏 The antenna elements receive the rf signal and the diodes rectify the alternating currents into direct currents to drive the meter 👌⚡👌

Thanks my Friend. I expected it would have auto deleted by now.(Settings to Auto Delete after a certain inactive period) I had to let it go as I no longer had the telephone number associated with the account. I hope life is treating You well Mate 👌 Cheerz & 73 from Crazy Ham ⚡🙏⚡

Awesome Comment my Friend ⚡🙏⚡

Thanks My Friend, 73 de VK3VKe ⚡🙏⚡

I think you missed my reference to an excitation of the system with an external signal or the possibility of background radiation 🙏(Words to that effect) Hence my Suggestion of it likely being a Good Rectenna System. (Rectifying Antenna) AC RF /DC Bais) I also made reference to Tunable Inductors for tuning to Resonance which of course is frequency dependent. Thanks for your Comment & Happy 2024.