Tesla's Magnifying Transmitter "Replications"

[Farmhand]

dragon

Great theory! I have almost identical.
Look what Tesla said :

"I will be quite explicit on the subject of my magnifying transformer so that it will be clearly understood. In the first place, it is a resonant transformer, with a secondary in which the parts, charged to a high potential, are of considerable area and arranged in space along ideal enveloping surfaces of very large radii of curvature, and at proper distances from one another, thereby insuring a small electric surface density everywhere, so that no leak can occur even if the conductor is bare. It is suitable for any frequency, from a few to many thousands of cycles per second, and can be used in the production of currents of tremendous volume and moderate pressure, or of smaller amperage and immense electromotive force. The maximum electric tension is merely dependent on the curvature of the surfaces on which the charged elements are situated and the area of the latter. Judging from my past experience there is no limit to the possible voltage developed; any amount is practicable. On the other hand, currents of many thousands of amperes may be obtained in the antenna. A plant of but very moderate dimensions is required for such performances. Theoretically, a terminal of less than 90 feet in diameter is sufficient to develop an electromotive force of that magnitude, while for antenna currents of from 2,000-4,000 amperes at the usual frequencies, it need not be larger than 30 feet in diameter. In a more restricted meaning, this wireless transmitter is one in which the Hertzwave radiation is an entirely negligible quantity as compared with the whole energy, under which condition the damping factor is extremely small and an enormous charge is stored in the elevated capacity. Such a circuit may then be excited with impulses of any kind, even of low frequency and it will yield sinusoidal and continuous oscillations like those of an alternator. Taken in the narrowest significance of the term, however, it is a resonant transformer which, besides possessing these qualities, is accurately proportioned to fit the globe and its electrical constants and properties, by virtue of which design it becomes highly efficient and effective in the wireless transmission of energy. Distance is then absolutely eliminated, there being no diminuation in the intensity of the transmitted impulses. It is even possible to make the actions increase with the distance from the plane, according to an exact mathematical law."

Yes that's exactly right, only in a more restricted sense he says the Hertzwave radiation is reduced to neglegable, and only in the narrowest significance of the term is it proportioned to fit the globe.

I've build a model sized one. or pair.

[lamare]

Condensed Intro to Tesla Coils and Theory of Wireless Power deal with the magnifying transmitter directly so perhaps you should check them out. Great work so far Farmhand keep it up

Raui

I am digitizing the Theory of Wireless Power:
Tuks DrippingPedia : Theory Of Wireless Power

Much easier to read than the scanned pdf

I'm about 75% trough, I guess. The hard part is the written part. I have to do this by hand....

I also added some notes to other references, like the Corum's, etc.

The part on the Oscillating Current Transformer is finished and is also accessable at a separate page:
Tuks DrippingPedia : The Oscillating Current Transformer

Oh, and should you note some typing errors or otherwise want to help a hand: the password is the name of this forum, without "forum" and then a 3 for the second e. The password is not there to prevent you guys from editing the wiki, but to prevent spammers from messing things up.....

[MonsieurM]

Lamare, in the following picture, is that a caduceus coil



Thank you for your reply

[lamare]

Lamare, in the following picture, is that a caduceus coil



Thank you for your reply

No, I they are representations of energy flows in the shape of standing electro-magnetic / electrostatic waves:

The energy of this standing wave is refracted thru the coupling transformer thereby exchanging energy with the other standing wave as shown schematically in figure (7). It can be seen that the T.M.T. involves three distinct standing waves in its operation, each coupled to the other thru two points of refraction. Each of these standing waves represents a distinct dimensional aspect

[MonsieurM]

Thank you for your quick reply, the reason i was asking, was because of this doc (see link page 2), in which you see an illustration of a Caduceus coil being discussed by Tesla

http://energythic.com/usercontent/3/...cuum_tubes.pdf

[lamare]

Thank you for your quick reply, the reason i was asking, was because of this doc (see link page 2), in which you see an illustration of a Caduceus coil being discussed by Tesla

http://energythic.com/usercontent/3/...cuum_tubes.pdf

I don't have the time to check this out now, but you may want to check one of my previous posts out, about bifilar coils, etc:
http://www.energeticforum.com/115135-post1341.html

[MonsieurM]

I don't have the time to check this out now, but you may want to check one of my previous posts out, about bifilar coils, etc:
http://www.energeticforum.com/115135-post1341.html

will do

[Farmhand]

Thanks lamare, I'm in a good mood I have a hilarious video soon, uploading now.

Next video should make anybody laugh.

I was testing the receiver output (low voltage winding) for a cap charge from the FWBR so I might try a motor energiser powered from it and I was surprised to see 780 volts and over on the 2 x 2.2 uf caps in parallel so I shorted them and they fill fairly quick they are rated to 275 volts AC. The voltage level seems to fluctuate in the caps for no reason too very strange, but shorted they go bang. Funny thing happened with the current draw aswell. I explain what I think in the video. Some load equals less current draw.

This is the crazy circuit I came up with to go on the output, I think i'll need an SCR instead of a mosfet. Or a voltage regulator. I realise the reed will have to placed correctly and I think it should go before the coil, I just drew it funny.
https://skydrive.live.com/?cid=32a91...1277&sc=photos

This drawing is inspired by Slider and the Muller dynamo thread, bt I only have an old wheel to use.

Monsieur I will most likely need to get a ball to wind the spherical antenna on in two pieces. I'll try it as soon as possible.

Cheers

[MonsieurM]

Thank you Farmhand for taking the time to experiment some of my ideas

in the meantime, although i know you seem to have an aversion to math (like me ), i found this about self resonance, hope this helps you

Check this out

coil self-resonant frequency estimation, theory, and history

coil self-resonant frequency estimation, theory, and history

Hi Ed,

Mark R. posted the self capacitance formula due to Medhurst
in a previous post. If you use this formula in conjuction with standard
inductance formulas for soleniods (like Wheeler's), you can compute
the self resonant (no top terminal) frequency of most coils. I have found
that it works very well for predicting most of Malcolm's measured
frequencies.

If you want to read a little more of Medhurst try:
"HF Resistance and Self-Capacitance of Single-LAyer Solenoids" by
R.G. Medhurst, Wireless Engineer, Vol 2, p35, Feb 1947
*Note: the range of frequencies he used does not allow his Q formulas
to work at normal Tesla coil frequencies.


If you are just interested in computing self-resonant frequencies
there is another method which I have found useful and generally accurate
to about 10% for all coil sizes - space wound or not. Its limitation is that
it probably shouldn't be used for aspect ratios (Height/Diameter)<1 due
to the assumptions of the original derivation.

The formula is:
(1/5)
29.85 x (H/D)
F = -------------------
N x D

(hope the ascii came out)
where
F= self resonant frequency in Mhz of an 'isolated' coil
H= coil height in meters
D= coil diameter in meters
N= total number of turns

Make sure the top line reads " (H/D) to the 1/5 power"
Note that the frequency is a very weak function of the
aspect ratio (H/D), but a fairly strong function of the number of turns
and the diameter.

This is an adapation of the formula for Helical Antennas found
in Reference Data for Radio Engineers as well as in the section on
slow wave structures in "Fields and waves in Communication Electronics"
by S Ramo, J R Whinnery, and T D Van Duzer. A form of this equation also
appears in both of the Corum brother's books:
"Vacuum Tube Tesla Coils" and "TC Tutor"

Incidentally, the Corums incorrectly attribute the analysis of the helix to
Kandoian and Sichak. These guys actually just made a simplification of the
formula reported earlier by JR Pierce (1947) and Franz Ollendorf (1925)
and even more amazing : Pocklington (1897) (see below).

ps: a tennis ball does not deflate

[Farmhand]

Thanks Monsieur, I realise the math is very important, but you're right I have an aversion to it. It's just no fun ! I will need to try to understand as much as I can though to have more fun.

Edit. here is the receiver outside next to the water tank lighting a fluro.
https://skydrive.live.com/?cid=32a91...1278&sc=photos

P.s. Mosieur I was thinking of a soccer ball size. I might want to keep it, the ball and the antenna.

[Farmhand]

Here's the video- YouTube - &#x202a;700 volt cap charge.wmv&#x202c;&rlm;

Sorry about the swinging the camera around again.

P.S. I was thinking maybe the voltage was fluctuating at over 500 volts because the dialectric in the caps was breaking down. If so

[Farmhand]

Hi all, No laughs for that video, ok then. I managed to get my motor circuit to work seems ok very efficient circuit but the reed is not the best and when I reduced the base resistance to zero it fused the reeds of course. My rotor is far from ideal though and bearing is not so good. I might try a hall if I can find one. if not I'll use another reed and the appropriate resistors.

I'm not able to repeat the 700 volt cap charge since playing with the tuning but I'm sure I can find it again soon, I was able to induce a similar effect with a bit less voltage through tuning but not the same, I might put that down to grabbing some of the 240 from the walls somehow.

Today i'll set up a long thick wire to act as a virtual ground, Cody demonstrated 80 meters, I don't think I have that much wire so I'll do what I can.

I also need to modify the toroid terminals a bit.

Cheers

[Farmhand]

While I was doing some pre testing messing about I noticed a strange effect.

I was lifting the top terminal free of the coil on the receiver with only a voltmeter on the output coil FWBR and I noticed a few things,

1. if I just touch the terminal the voltage go's from 42v to 90v.
2. If I lift it off the voltage go's up to about 200v
3. if I hold it just above the coil about an inch or so the meter go's out of range over 1000v, however doing that causes an increase in input to about 1 amp.

I probably wouldn't have noticed except for the little arc as I lifted the top off,https://skydrive.live.com/?cid=32a91...1279&sc=photos

I removed the pipe's from the tops too, for now.

I have no idea what this actually means. but I will try to figure some part of it out. Now i'm confused again so i'll just test it how it is. Then I guess I'll have to make some more terminals differently. Hopefully my function generator arrive's soon.

Oh and my motor circuit failed again but not the reed this time, it just stopped drawing current and slowed down. It was running at 30 rpms for a long time using 30 Ma a full sized bike wheel with 18 magnets, must be the slowest wheel ever.

Cheers

[Farmhand]

Hi all, the function generator arrived and being a cheap one it came with no documentation whatsoever no instruction, nothing not even one piece of paper.

Also it came with no output lead.

I guess i only have myself to blame. So anyway I was wondering if I could get some hints on how to set it up and soforth, I guess i will need a BNC lead or something for an output lead, I would like to use it in conjunction with a mosfet and mosfet driver to do the actual switching from the Function generator signal.

Here is some pics
Back https://skydrive.live.com/?cid=32a91...1280&sc=photos

Front https://skydrive.live.com/?cid=32a91...1281&sc=photos

Item on Ebay Function Generator 0.1Hz - 3MHz with AM/FM & VCF input | eBay

Any help appreciated, this is a new one on me it took me a couple of weeks to work out ow to use the scope.

Thanks and Cheers

[Farmhand]

This test was a bit of a fizzer but better than the last, this is about 40 or 50 meters. The transmitter is inside the metal clad bunkhouse/shed just to the right of and behind the coil, with the aluminium screen door closed the light was dimmer. Transmitting from inside a steel shed might interfere with it a bit. There's a 270 ohm resistor and 2 x 5mm LED's in series but no capacitor, maybe a small cap on the output might help, if I solder the cap the the LED's first then I shouldn't blow any LED's.

https://skydrive.live.com/?cid=32a91...1283&sc=photos

Inside the hut the receiver held 4.9 volts over the LED's how i had it tuned and when I took it away it went down to 3.2 volts.
https://skydrive.live.com/?cid=32a91...1282&sc=photos

I seem to have damaged my mosfets or something or the coils are affecting the circuit on the board because my drive signal is very ugly looking now.
Not sure what to do about that.

I'll make some change's and try again.