Re: Tesla

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

Original poster: "Gary Peterson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <glpeterson-at-tfcbooks-dot-com>

Hi Dave,

> Thgis represents new physics.
> It is unknown in electronics.

Is it possible for a tuned antenna to have an effective area that is larger
than its geometric area?

> The standard regen receiver works on a different
> principal....

Could you explain that principle?

Gary

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, July 30, 2002 8:51 PM
Subject: Tesla


>
> Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<davep-at-quik-dot-com>
>
> >>He didn't have a "local power supply" in the patent diagrams he
> >>published.
>
> > Some of the best receiver circuits are found in the COLORADO
>
> > SPRINGS NOTES.
>
> I suggest these are the best receivers 100 years ago.
> In the interveningperiod, technology has learned much.
>
> > In fact Tesla considered or investigated at least 125 different
variations
> > of receiver design while in C/S.  He included a battery along with a
> > variable resistance in those circuits which used coherers, so that a
small
> > DC bias voltage could be placed across the device--an antenna and ground
was
> > also connected.
>
> I find it curious that a broadcast power system needs a battery.
>
>   In operation the bias voltage would be adjusted to a point
> > just below the coherer's breakdown voltage.   When so strained a small
> > increase in voltage resulting from an incoming signal would result in
> > coherence and the increased current flow would operate a small relay,
which
> > also required a battery.  In some of his receivers he would also mix the
> > output of a local oscillator to create an audible tone in a telephone
> > earpiece.  It can be argued this anticipates certain aspects of the
> > heterodyne receiver.  He designed a small isocronous electromechanical
> > oscillator that was used this purpose.
> >
> > The circuit diagram of one of Tesla's regenerative-type receivers can be
> > viewed at www.tfcbooks-dot-com/images/articles/tws5.1.gif.
> >
> >
> >>>>August 3 he shows a number of receiver arrangements in which RF
> >>>>
> > current is
> >
> >>>>fed back from the secondary side of a resonant transformer to a
> >>>>
> > coherer
> >
> >>>>located on the transformer's primary side, making the coherer more
> >>>>sensitive to incoming signals.
> >>>>
> >>That doesn't make sense.  The best any circuit can do is deliver ALL of
> >>the received power to the load (the "sensitive device", in this case),
> >>and without a local power supply and active component such as a tube or
> >>transistor, "regeneration" doesn't make any difference.
>
> > I have a little difficulty explaining it myself, but the fact remains
that
> > regenerative receiver circuits are real.  Regeneration is a means of
> > increasing antenna current by counteracting the resistance of the entire
> > antenna circuit.
>
> Thgis represents new physics.
> It is unknown in electronics.
>
> > By the introduction of what might be called negative
> > resistance through the addition of a feedback loop, antenna-field
> > interaction is increased and energy is absorbed from a greater area of
the
> > incoming wave front.
>
> This effect has escaped the notice of all developers since.
> (Hint:
> The standard regen receiver works on a different
> principal....)
>
> > The basic regenerative circuit is not often used in
> > present day receiver front ends for a number of reasons, the most
> > significant of these being an inherent form of instability.  Maximum
> > sensitivity is achieved at a point just before the detector breaks into
> > oscillation and this could be initiated by something as simple as wind
> > shifting the antenna.  As the appearance of oscillating regenerative
front
> > ends on the broadcast bands became a more and more regular occurrence a
> > decision was made to phase the regenerative detector out of general
service.
> This is a standard regen receiver, and has nothing to
>
> do with the antenna.
> (hint:
> Isolate the regen section with a gain of 1 amplifier.
> The regen portion works fine.  Thus: it is not
> affecting the antenna....)
>
>
> >>Actually coherers and magnetic detectors aren't very sensitive at all.
> >>The typical coherer requires a signal of the order of FOUR VOLTS to
> >>operate, with the power depending on the non-conducting impedance.
>
>
>
> > What do you suppose would happen if you applied, say, 3.999,900 volts
across
> > your cohererer and then transmitted a little RF power from a few
wavelengths
> > away?
> I'd be interested in how to to deliver repeatable,
>
> quiet, 0.00001% accurate anything?
>
>
> >>>        Much has been learned about RF propagation since
> >>>        Tesla's day...
>
> > Tesla would probably say, 'not enough.'  In 1919 he wrote:
>
> >     "For more than eighteen years I have been reading treatises, reports
of
> > scientific transactions, and articles on Hertz-wave telegraphy, to keep
> > myself informed, but they have always imprest me like works of fiction.
. .
> > . The Hertz wave theory of wireless transmission may be kept up for a
while,
> > but I do not hesitate to say that in a short time it will be recognized
as
> > one of the most remarkable and inexplicable aberrations of the
scientific
> > mind which has ever been recorded in history."
> Hint:
>
> If Hertz theories did not work, the internet would
> Stop.  (Yes.  I'm an engineer._
> The internet works.  One may draw certain conclusions
> from this.
>
> best
> dwp
>
> ...the net of a million lies...
> Vernor Vinge
> There are Many Web Sites which Say Many Things.
> -me
>
>
>