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

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>


> Ed,
>
> Thanks for the update.  Any recommendations regarding substitutes 
> for the four Siliconix VN66AF FETs or the VMP-1 would be 
> appreciated.  As I mentioned in an earlier post, I'm planning two 
> Part-15 compliant 1750 meter beacon transmitters.  One will have a 
> Marconi antenna with an insulated counterpoise and the other will be 
> a well-grounded Tesla coil with the exact proportions of the 
> oscillator shown in U.S. Patent No. 1,119,732, "Apparatus for 
> Transmitting Electrical Energy" (see 
> http://www.tfcbooks.com/patents/tower.htm).  Both transmitters will 
> have nearly identical driver circuits operating on the same 
> frequency at the bottom of the 160-190 kHz experimenter's band.  In 
> both cases the receiving end will be essentially identical to the 
> launching structure of corresponding transmitter.
>
> Gary"


> Gary:

    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