Re: longitudinal waves

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

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Tesla list wrote:

> Original poster: "David Thomson by way of Terry Fritz
><twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>
 
> Hi Steve,

> > What are you going to do to prevent normal EM pickup of the
>>radio waves?
>> Two wires spaced 1/2 wavelength apart, oriented at right angles
>>to the source sounds like it'll pick up normal EM waves just fine.

	Concur.  cf any book on antenna design.
 
> The longitudinal wave has no voltage associated with it, so due
> to the quarter wave construction (more or less) of a radio antenna,

	radio antennas work fine at any length.  1/4 wave is
	one of the EASIEST antennas.

> the zero voltage will be near the level of ground.  Placing my long
> wires near the ground should help eliminate the EM and RF waves.

	There is a whole class of nearground and underground antennas,
	for specialized applications in electromagnetic and radio
	work.

	best
	dwp