Step 7: Make a Peculiar Tesla Football Antenna

This coil was one of Tesla's later designs, and is said to have spooky anti-gravity effects when pumped with the correct frequencies and voltages. I won't be working in that high-power range with this un-powered crystal radio !

The core of the Tesla Football Antenna is made with four 2 inch paper cones glued and taped together. The paper cones were doubled up, two on each side, for strength and smoothness.

The 30 gauge wire conical coils are wound laboriously by hand. The thick 10 gage copper wire was carefully bent to conform to the football coil without disturbing the coils of the coil. (Note to self...don't try this again without coating the wires with a resin or glue first, because the coils will start unravelling...)

After this small coil-winding feat, two snazzy Banana Plug ends are put on. These ones were found at an electronics store.

Here's a link to a similar coil that puts out sparks!

<p>Hello. Is it necessary to use Plexiglas? Does using the normal metal cover that comes with the jar interfere? Thanks!</p>
<p>People really believe this is &quot;Tesla's spirit radio&quot;! Ridiculous! :-)</p>
Seems like scientific consensus (and laypeople who think they're experts after reading one article) have been wrong before. How do you feel about geocentrism? Just saying.
<p>Mrfixit,</p><p>I enjoyed your post, do you have the video's anyplace that does not require adobe, perhaps on you tube? I love the look of double coils. Is the sound program a freebie for the MAC?</p><p>Have you ever listened to telephone poles? (I do not kid here, there was a site many years back that was all about &quot;singing telephone poles&quot; and it was not a rock group. I wish I had the site right now, I ask everywhere I go whenever it seems appropriate.</p><p>Kinda like when the Ent's ask the Hobbits if they have seen the Lady Ents!!</p><p>thanks</p><p>sparkie</p>
any old school electricians out there, you know how to make this work without the use of a laptop? I am pretty sure Tesla did not use a laptop to power the speakers.
<p>Xtal head phone/ceramic headphone. You also could try a piezo tweeter, or piezo mike/speaker.</p><p>(the link to mike has all the parts)</p><p>Remember b4 their were amplifiers, they had simple Xtal headphones, (cans).Unfortunately Lindsay's Publications went out of business, they had scads of books on everything old.... how to build from scratch.</p><p>If size is not an issue, you could make a variable cap out of cardboard and aluminum foil.</p><p>Just google Xtal Radio , or Crystal Radio and go to one of 300 sites. Some show you how to make individualy parts, need a fixed cap, roll your own! What is in a simple cap, foil and insulator paper</p><p>To make it loud enough to hear w/o putting it in the ear, try making a passive smartphone amplifier. (here on instructables they have a few of them.) Ten add the Xtal headphone as the source. Inside a bose wave radio is a baffle that is a folded horn, go for it!</p>
<p>You could probably just stick an old (or new) small amp on there. Should not be too hard.</p>
Guys! You need to pay attention to the ads in the comments! Everything you need is at Mikes Electronic Parts!! Lol
<p>As best as I can determine the 60/160 pF variable capacitors no longer exist. Nothing on google, eBay, Aliexpress, or any antique radio supply that I can google. Does anyone know of a source?</p>
<p>Check out Mike's Electronic Parts &quot;Spooky&quot; Kit here: https://www.mikeselectronicparts.com/product/spooky-tesla-spirit-radio-parts-kit/</p>
<p><a href="http://www.ebay.com.au/itm/5pcs-Duplex-223p-60pf-140pf-2-1mm-Hole-Shaft-Radio-Variable-Capacitor-s484-/281822604077?hash=item419defab2d" rel="nofollow">http://www.ebay.com.au/itm/5pcs-Duplex-223p-60pf-1...</a></p><p>This should work (I have built a crystal radio with these before).</p>
Thanks for the tip. I ordered on U.S.A. eBay site. No worries!
I updated the parts list to reflect the new parts and near-complete Kit available from <a href="https://www.mikeselectronicparts.com" rel="nofollow">Mikes Electronics</a>. Check it out!
<p>How can we trace down the original parts list that Nikola Tesla himself used?</p>
<p>You can't because tesla didn't do this but you can track down old diodes and capacitors.</p><p>For example:</p><p><a href="https://www.mikeselectronicparts.com/product/1n450/" rel="nofollow">https://www.mikeselectronicparts.com/product/1n450...</a></p>
<p>You can't. Tesla simply didn't do this.</p>
I'm absolutely lost on how you've got the cone antenna wired to the device... Can you draw a diagram or something? Thank you so much!
Hi again, so we have the radio made but can't get anything out of it except a very low static signal. And the variable capacitor does not seem to affect anything. We have the radio going into a sound card so we can connect to active monitors as the built in output on the computer was too low volume. So all we seem to be doing is getting cool effects off a very small amount of static, no am radio or variable with capacitor or light diode! I've read all the comments so not sure if there's much you can suggest but let me know if you have any more tips. Thanks, Hannah
There may be a problem with a burnt diode or bad connection. The diode can burn from the heat of soldering it. (Note: Use a pliers as a heat sink when soldering. )<br><br>To see if things are working properly, you can try using a long antenna to get more gain on local radio signals. I use a 20 foot piece of copper wire strung across my living room ceiling! :) Otherwise without antenna, may be hard to hear local am radio.<br><br>You should be able to hear an electric motor for example as a test. A Dremel tool or electric drill close to the radio should be easily heard. Use multiple &quot;Gain&quot; modules if necessary to increase the volume. To hear laser, needs a delicate setup with lots of gain. The radio must be &quot;on the edge&quot; by being very sensitive.<br><br>You might be better off using the built-in output of the computer, and then amplifying that. (As the sound card may be cutting off and may use a different grounding system.) <br><br> What computer do you use?<br>
<p>You must use Audio Hijack Pro or comparable Windows software to amplify the signal and give it texture. I use three levels of gain, and other modules to modify the sound. Then, static takes on a whole new dimension.</p>
hi there - yes we are putting it through audio hijack and using your screenshots for reference - and yes the static does sound good! but i don't think the variable capacitor is working - should this change the sound of the static too? we get no change when turning the knob... also no change with electromagnetic interference or with shining the light on the diode...<br>thanks, hannah
How can pay you to make me one of these radios?
<p>You can call me dumb dora are anything you like but what is this spirit radio for.? I have seen the video's and post. Is it a listening device of some kind. Like a micro phone? That is what I am understanding. And if it is why go to all the trouble? Please email me because I will probably not remember how to get back to this site. I really would like to know what it is for. Also my great great great grandfather invented the radio receiver is this what this is.? Here is the link that explains his invention, his diagrams on how he built the receiver are there also. </p><p><a href="http://www.wdrcobg.com/doolittle.html" rel="nofollow">http://www.wdrcobg.com/doolittle.html</a></p><p>Here is my email address if someone could explain to dumb dora please I am interested on what it is and what it is for. Judykdoolittle@gmail.com</p><p>Thank you !!</p>
<p>Just built this.. I cant get anything but static. No sound reactions to light on the diode or anything. I can get am if I touch the antennas, thats about it.. I quaddrupil checked my connections and even dis-assembled and reassembled.. still absolutely nothing but am radio when touched and static when not touched... Help anyone??</p>
<p>If you get static and AM when touching, you have done everything correctly. I believe you need to plug into the sound port of a Mac computer running Audio Hijack software set with the Spooky settings... Also, Increase signal by using a 20 foot antenna and ground if you wish.</p>
<p>&quot;Tesla's spirit radio&quot;? :-) Are you for real? :-)</p>
<p>Been messing with it more.. Still nothing but static.. Diode is non-responsive to light, does pick up my soldering gun though. I used a variable capacitor along with a ferrite loop-stick from an old radio though.. Could that be the problem? What pf does any old radio usually pick up? I got a rad germanium diode by the way; i dont know if that makes a difference?</p>
Has anyone successfully built one? <br>Im willing to pay someone to build one for me.
<p>People are naive, Tesla never did this nor it is any &quot;spirit radio&quot;. This is disinformation and I think the creator of this joke is laughing at the ignorance.</p>
<p>How can one use this with a PC instead of a MAC? Thanks :-)</p>
<p>Hiya friends! I've got mine hooked p to a Macbook Pro, which means I had to use a USB external sound adapter since I don't have a sound input jack. Nothing is being picked up by the radio, and I haven't had any luck with light or touch altering the sound. I just get static. Any advice would be hella appreciated and returned with a good joke and a digital wink!</p>
<p>Hi, I've just received this loopstick antenna from ComtrolAuto - it has one black (knitted out of two) and two thin wires (on far left and far right end). Does it matter which thin (non-coloured) wire do I take to solder with non-ground C1 capacitor? Thank you so much for helping a newbie :) Kind regards!</p>
can I plug in headphones ... directly into the jar...
<p>i hear Nikola Tesla's research was shut down by the government because he posed a threat to their system, can any one tell me why? </p>
<p>Why did you build it in a glass jar instead of on a wooden base like a more traditional crystal radio? Is there something special about the glass jar, that just building it on a wooden base would not provide?</p><p>Thanks.</p>
The glass jar is mostly just a cool idea I thought of, but it does have some scientific basis. The clear glass allows the diode to receive unshielded environmental input such as ambient light, laser, and magnetic and electromagnetic waves without much interference, at the same time protecting the circuit from dust, dirt and young prying hands.<br><br>A wooden base is fine...but then it wouldn't be a Spooky Tesla Spirit Radio ! :) Cheers, Rick<br>
<p>Hi, thanks so much for this great instructable! I'm just getting to work on mine now, and had a question about the ferrite loopstick antenna. I have a ferrite core (I bought this one, http://www.ebay.co.uk/itm/62mm-Rectangular-Ferrite-Antenna-Bar-AM-MW-LW-Radio-Loopstick-Core-/120852688164?ssPageName=ADME:L:OU:GB:3160), but wasn't sure about the wrapping. Is it just a case of wrapping a thin wire around the core 75 times? In the picture it looks like you have the ferrite core, then something (tape or cardboard?) around the core, then another small bar (what is this, iron?) and then the thin wire wrapped around that. If you could clear up what that is, that would be great. Thanks a lot!</p>
I created the spirit radio and It picks up higher frequency waves. Doesn't change a whole lot though. <br>I am unable to get light to affect it. Different types of lights even. I'm using a PC voxal software program.<br>Did I wire something wrong? Or is it my sound settings?
I had to use 3 pitch control modules added in the Audio Hijack software, double double gain, and a lot of fiddling and adjustments to get the light sensing to work. Try a laser first or even close to a 60 cycle lightbulb. The secret is that the laser will not read on the diode except when the light moves on and off of the diode. (i.e. With DC laser it is the CHANGE of light, not the light itself that gives the tone. An AC light will work as continuous tone )
<p>I have played around with all of the settings that I know of. Tried AC and DC lights on the diode.<br>I have iPhones and iPad's but have been unable to find software that I know for sure works. Maybe one day Audio Hijack will release a PC version. </p>
<p>Hello! </p><p>Objective: build one Spooky Tesla Radio. (see Photo)</p><p>Outcome: Successful! Build time: about 4 hours once I had all the parts.</p><p>Turned out a little different than the instructions, different size jar (no idea what impact this has...I'm guessing purely aesthetic?) </p><p>Variable Capacitor: same as spec</p><p>Downloaded patch and using Hijack for Mac</p><p>Results: AM radio station test ok</p><p>Spooky noises test = Yes but hard to tune in (still working on it) Sounds like a lot of people all talking at once! </p><p>Lighting noises = Success! </p><p>Still need to make the cone antenna</p><p>Questions: Is there a specific set of filters in Hijack required to hear the spooky noises?</p><p>Is there a patch for this or do you only hear them once you've made connected the cone Antenna? </p><p>Cheers....great kit! :)</p>
Excellent! <br>I am always happy to see a new Spooky Radio come into the world!<br><br>Try these Spooky patches for Audio Hijack. <br><br>Spooky Radio Patch 1 https://drive.google.com/file/d/0B1ty3oeDN9qvVzlqdkxOSmxYdTQ/view?usp=sharing<br><br>Spooky Radio Patch 2<br>https://drive.google.com/file/d/0B1ty3oeDN9qvTk55bS1xbEZvSWs/view?usp=sharing<br><br>Cheers, Rick
Hi Rick,<br><br>Appreciate you sending the patches, let you know how they go.<br><br>Cheers <br>Grenville
Is it possible to buy one on eBay premade? I'm not so good with building things
<p>hi there - do you know if there is an app that can be used on an ipad to filter out the noise from these radios, as an alternative to using hijack audio pro as you suggest above? many thanks!</p>
You can use Splashtop to access your desktop or laptop mac and Audio Hijack. The new Garageband for iPad may be able to handle the job as well...I need to experiment with it to see.
The Tesla antenna. Great fore RF hunting , It was a tricky thing to wind but had a lot of fun.
Good one! Thanks for sharing it. Tesla said that shape had special levitation characteristics when activated properly! :)<br>
<p>Hello !<br>My Name is Oliver and i attend to HTX in Denmark and I want to as my final project, to build and explain how the Spirit Radio works. <br>I have looked through the references given in this article, aswell as the comments and the internet without luck I'm afraid.<br> <br>But i was wondering if anyone had any sources, or at least pointers, as to where i can find formulas/equations to describe, primarily, the correlation between light and sound, aswell as the part where you use a magnet turn it into a microphone.<br><br>I need this information to prove that this is a do-able project.<br>If anyone can help me, please send an e-mail to Whirlz2300@hotmail.com <br>Thanks in advance!</p>
cool little radio. sounds loud for a crystal set but very cool

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Bio: I am re-inventing myself as an inventor, after too many years as a mechanic! I enjoy learning from Tesla disc Turbines, magnetic motors, and Crystal ... More »
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