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Re: Tesla Receiver Coil ..........success?

Original poster: "Gary Peterson" <gary@xxxxxxxxxxxx>


Original poster: Ed Phillips <evp@xxxxxxxxxxx> 

    I just mailed a Priority Mail envelope with all of the LF pages in it,
plus recommendation that the IRF510 (two bucks from Radio Shack, cheaper
from distributors) should work fine in place of the original transistors I
used.  As for Tesla's patent, it still looks to me just the same as it did
when I first read it a long time ago.  A short vertical antenna with
capacity loading at the top and a tuned resonant transformer at the
bottom.  A very inefficient radiator unless the height is greater than
several percent or so of the operating wavelength and the ground system
has very low resistance.  It will launch a ground wave just like any other
vertical antenna but I'm still skeptical about any miraculous power
transmitting capabilities.  It will be interesting to see what you
measure.

Ed 

Thanks for mailing the info on your LF Lowfer beacon transmitter.

As for Tesla's "Apparatus for Transmitting Electrical Energy," patent No. 1,119,732, dated Dec. 1, 1914, I agree; it looks like the oscillator would be very inefficient as a source of radio waves, i.e., far-field electromagnetic waves that have closed back upon themselves and are no longer associated with the launching structure, and having their E and H components in phase. Looking at the drawing as if it were a "radio" transmitter, the helical resonator becomes a loading coil, the short and fat conducting cylinder becomes an antenna, and the elevated terminal becomes an elevated counterpoise. The "loading coil" would not contribute much energy to the radiated field. Being only a minute fraction of the electrical wavelength in length and quite large in diameter to boot, one would expect the antenna itself to be a rather poor performer. The tophat would also not contribute to the weak vertically polarized field, but it would serve to increase the antenna current.

As for power transmitting capabilities, I think of Tesla-coil transmitters in the same way as I think of the power transmitting capability of "radio wave" transmitters. Both Tesla coil and "radio wave" transmitters can be rated in terms of power input (input to the final stage), power output (peak envelope power), and radiated power (isotropic or effective radiated power).

In a similar fashion, both "radio wave" receivers and Tesla Receiving Transformers can be outfitted with instruments to measure the amount of transmitted energy that appears at the receiver's output. The question is, relatively speaking, for the four individual cases, how much energy makes it through from the two transmitter's inputs to the different receiver's outputs.

Gary