[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: longitudinal waves
Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>
Tesla list wrote:
>
> Original poster: "David Thomson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>
>
> Hi Dave,
>
> > One Assumes such waves ought to exist (....) at all freqs, and other freqs
> and sources are easier to work with...
>
> They do exist at all frequencies. Every EM wave is associated with a
> longitudinal and a rotational wave. I can't imagine how it could happen any
> other way.
>
> > > There is a whole class of nearground and underground antennas,
> >> for specialized applications in electromagnetic and radio
> >> work.
>
> I know there are underground antennas. As you mentioned, they are ELF
> related. But I'm not aware of any antenna structures designed to work
> directly off the ground.
>
> Today I did the calculation for the longitudinal experiment I proposed. The
> long wires need only be about 4.25 inches apart to pick up the target I have
> set at 1390KHz. I've surveyed my yard. I should be able to lay two 100
> foot wires 8.5" apart on the ground and oriented in the direction of the
> broadcast antenna to receive the waves. The weather is looking good so I
> may be able to do this within the next week or so.
would this not just be a travelling wave antenna (sort of like a
rhombic?).. Presumably, you're going to look at the difference in voltage
between the wires?
You might want to take a look at some work by George Hagn on the Open Wire
Line (OWL) method for ground parameter characterization. He did a lot of
research on the electrical behavior of pairs of wires laying on or slightly
in or suspended above the ground. You'll need to take into account all the
non-longitudinal effects if you're looking for the longitudinal signal.
>
> Dave