[sdiy] RCA theremin antenna shape

[John L Marshall]

I believe that both antennas are single connection.

The two antennas should be primarily electrostatic. They are influenced by
your body capacity.

If one of the antennas was working as a loop it would be primarily
electromagnetic. You would need something with magnetic properties to
influence the magnetic field. Think of White's metal detectors finding coins
and pop can tabs or, the metal detector at the airport.

The antennas at right angles gives their surface a different orientation
which should work well. But then, the antennas are so short relative to the
frequency, I suspect that they are near perfect isotropic radiators.

John


----- Original Message -----
From: <pfperry at melbpc.org.au>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, January 26, 2002 7:40 PM
Subject: [sdiy] RCA theremin antenna shape


> Does anyone know whether the horizontal (volume) antenna of the original
RCA theremin is part of a coil, rather than just stuck on top of a coil?
> Because, there is a debate on wheter the shape matters, or whether it was
made like that so you could easily dip your hand in for a quick muting.
> I suspect that it is a coil, and that the 'flattened' nature is to reduce
the external field, so that it desn't interact so much with the vertical
pitch antenna.
> Any of you hams & RF guys? Harry??
>
> paul perry (Frostwave analog fx melbourne australia)
> --
> Message sent by Webmail from melbpc.org.au
>