Faraday Cages Re: Mr. Richard Quick: about Ground Currents.

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Original poster: <davep@xxxxxxxx>


> A small relay, 12 VDC coil, connected as a
> buzzer, using normally-closed contact.
> A small topload (can of Hair Spray).
> A medium size metalic cabinet (for office use).
> An old PC power supply.
> A small transistor radio.

> With this arrangement, I connected the antenna of
> the battery-powered radio to a Ground pin on another room AC outlet.

> My idea is: the relay coil, topload and Faraday
> Cage connected to mains ground, comprises an LC
> circuit.  Every time NC contact is closed, the
> coil is charged with current.  When the contact
> opens, there is a charge accumulation on TopLoad
> and a small spark between contacts.  I have been
> able to run this system for an hour long, and
> arcing has not yet damaged the relay
> contacts.  Anyway, the relay has 4 sets, plenty
> of spares.  Breaks per second is higher than 60
> Hz, pretty good for a mechanic reciprocating break.
>
> Observations:
> * The buzz can be heard outside near the Faraday Cage.
> * Direct contact of radio antenna to the exterior
> of Faraday Cage, give stronger signal.
> * If I disconnect the Negative wire from the
> Faraday Cage, the signal is stronger, and can be
> detected at more distance (other power outlets,
> other rooms).  The device still inside the now floating Faraday Cage. *
> A normal TV reveals noise with and without
> Faraday Cage.  Cannont discern change in level of noise.
>
> My conclusions:
> * Faraday Cage seems to block more than 10% of
> signal, no matters if it is coming via ground conduction or radiation. *
> Ground conduction even with transmitter
> enclosed in a Faraday Cage, can be detected with
> a transistor AM radio.  Greater range if not encasing the Tx.
> * We cannot subestimate the electrostatic
> induction.  A Faraday Cage blocks this, leaving
> the success of the experiment to the ground currents alone.
> * I think for a working Tesla Link (Tx and Rx),
> is better not to use a Faraday Cage.
     Need lots more details on 'Faraday cage'.
     Takes a lot of effort/time to design & debug a
     _really_ quiet cage.

     (Been there, done that.)

      best
       dwp