Re: "Scotty, Beam me up!"

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Esondrmn-at-aol-dot-com>

In a message dated 2/22/01 7:59:31 AM Pacific Standard Time, tesla-at-pupman-dot-com 
writes:

<< The key thing that needs to be the same is the resonant frequency of the
 secondary.  The primary is just how you get the power into the transmitting
 secondary and out of the receiving secondary.
 
 Off hand, you want the transmitter loosely coupled (so that the spark gap LC
 "oscillator" can do it's thing), although, that might be something you want
 to study.  The recommendation for loose coupling is based on experience
 where you are trying to get long sparks, whereas what you are trying to do
 is radiate the most power, which might be a case where more coupling is
 good.
 
 The receiver should be tightly coupled (you want to get the power out of the
 secondary as quickly as possible), and you probably don't want a capacitor
 in the "primary" of the receiver, rather, the primary winding serves more as
 an impedance transformer to get the power at a more reasonable voltage and
 current.

>>I was under the impression that the receiver coil would be a grounded 
secondary with top load, tuned to the same frequency as the transmitter coil. 
 The receiver coil would not have a primary.

Ed Sonderman
 
 This implies, then, that you should have some way of tuning the secondaries,
 because even if you wind them exactly the same and use the same topload,
 etc., there are inevitably going to be differences, if only due to
 surroundings, corona discharge in the transmitter, etc.   Perhaps some sort
 of scheme with two toroids where you can adjust the separation to change the
 top load C? An adjustable inductor in series that you can orient in
 different axes? You probably only need to tune the receiver secondary, by
 the way.
  >>