"Art Unwin" wrote
...
On May 10, 6:58 am, JIMMIE wrote:
On May 9, 3:24 am, Szczepan Biaůek wrote:
"JIMMIE"
...
On May 8, 4:51 am, Szczepan Białek wrote:
It seems that at long distances should appear the phenomenon of
frequency
doubling.
See:http://www.rp-photonics.com/frequency_doubling.html
Is such?
S*
The laser must be fed into a non-linear medium for the doubling to
occur. The same would be true for RF.Normally the atmosphere and space
are considered fairly linear in respect to both RF and light, both
forms of EM radiation. Luckily for us this is the case, otherwise all
radiation would be multipled to xrays and beyound. The result would
probablybe the termination of all life as we know it.
Very interesting.
May be it take place. You do not analse the intensity after each
doubling.
My question apply to the two sources emitters (oscillatig dipole) in a
lineaar medium.
S*
The presence of a non linear medium is always required for frequency
doubling. The only part of the atmoshere that I know of that meets the
qualification is the ionosphere which contains plasma which could act
as a nonlinear medium. I suppose that if the signal were powerful
enough to produce ionization that a frequency could be doubled..
Jimmie
Hi,
Let me help you with your problem.
You mentioned a cycle which you know is equal to a period or
occillation of a radio wave. Let us say that an antenna charges up and
then radiates ie half the time or occillation for each action. Now you
have decided to apply power to a half wave antenna asnd not a full
wave antenna that is occupied in some action all of the time period.
Now you have to decide what your half wave antenna is going to do.
Charge up only and let the power leak away or radiate without having
any power!
What you have to do is to imagine a radiator as a tank circuit where
you have two energy storage areas, a inductor and a capacitor and for
the mom ent free from losses.
Thus the energy loads up the inductor which then empties into the
capacitor which in turn empties back into the inductor e.t.c Thus only
one charge is supplied and no more since the same charge is really not
being let go!
This is seen as perpetual motion which is an impossibility. Thus if
energy is going to be used it will only be expended for half a cycle
and then the circuit recharges for the next cycle. Now you should be
able to see that a half wave antenna is only capable of working half
the time so in no way can you be applying a doubling of frequency
motion when you only have a half wave antenna to work with. So S* go
back to your study but first replace your half wave antenna and re
think things out with a full wave antenna in loop form with a tank
circuit in mind and when you have all things in place
substitute your half wave antenna and determine what this does to you
tank circuit and radiation.
Our problem apply to the original Hertz experiment. See:
http://people.seas.harvard.edu/~jone...Hertz_exp.html
There is: "According to theory, if electromagnetic waves were spreading from
the oscillator sparks, they would induce a current in the loop that would
send sparks across the gap"
In EM waves are produced by the current (oscllator sparks in the Hertz
apparatus). One cycle is completed when the current flow to and fro.
But there is possible the other theory. Electric waves are spreading from
the ends (plates or big balls in Hertz apparatus). Now we know that
electrons have mass and are compressible. So at the ends appear and
disappear the huge charges. In that case an electric impulse is send when
the current flows to (from one end) , and the next when the current flows
fro (from the other end). So in one EM cycle are the two electric cycles.
So the frequency is not doubled. The electric is twice more.
It seems that at long distances receiving antennas should work better at the
electric frequencies.
BTW, what exactly means "Luxembourg effect" (Brian wrote: " e.g Luxembourg
Effect; so
doubling is possible.")?
S*