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Old May 17th 09, 07:07 PM posted to rec.radio.amateur.antenna
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Default Frequency doubling


"Dave" wrote
...

"Szczepan Bialek" wrote in message
...

Is it something wrong if a visitors asks about something?


if you ask then you would be expecting an answer and learn from that
answer. you have ignored the responses you have received and kept going
back to your own theories based on analogies that don't fit. if you
really want to learn then read and accept the answers you have received.


The question was: "It seems that at long distances should appear the
phenomenon of frequency
doubling.
Is such?"
S*

Till today was only one Yes (Brian Howie). The rest were No.
Today Dr. Barry L. Ornitz wrote: "Nowhere in all of the respected
literature will you find frequency
doubling caused by the two ends of a dipole."

So now I know what I want. Do you agree with Dr.?
S*


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Old May 17th 09, 07:21 PM posted to rec.radio.amateur.antenna
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Default Frequency doubling


"Szczepan Bialek" wrote in message
...

"Dave" wrote
...

"Szczepan Bialek" wrote in message
...

Is it something wrong if a visitors asks about something?


if you ask then you would be expecting an answer and learn from that
answer. you have ignored the responses you have received and kept going
back to your own theories based on analogies that don't fit. if you
really want to learn then read and accept the answers you have received.


The question was: "It seems that at long distances should appear the
phenomenon of frequency
doubling.
Is such?"
S*

Till today was only one Yes (Brian Howie). The rest were No.
Today Dr. Barry L. Ornitz wrote: "Nowhere in all of the respected
literature will you find frequency
doubling caused by the two ends of a dipole."

So now I know what I want. Do you agree with Dr.?
S*



yes, i agree, no doubling by dipole and none related to distance.

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Old May 17th 09, 11:35 PM posted to rec.radio.amateur.antenna
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Posts: 3,521
Default Frequency doubling

Szczepan Białek wrote:
So now I know what I want. Do you agree with Dr.?


The superposition of coherent waves is a linear function.
Therefore, there is no way for the superposition process
itself to produce harmonics.

For frequency doubling to exist, there must be a nonlinear
process. The question is: Does any nonlinear process exist
between the linear transmitting antenna and the linear
receiving antenna?

I once heard a pile of tin cans talking to me. Turns out
some rusted junction in the pile of cans was detecting
the FM from the local radio station. That was a non-linear
process. Lucille Ball is reported to have picked up Japanese
CW signals through the fillings in her teeth, again a non-
linear process.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com
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Old May 18th 09, 08:22 AM posted to rec.radio.amateur.antenna
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Posts: 197
Default Frequency doubling


Użytkownik "Cecil Moore" napisał w wiadomo¶ci
...
Szczepan Białek wrote:
So now I know what I want. Do you agree with Dr.?


The superposition of coherent waves is a linear function.
Therefore, there is no way for the superposition process
itself to produce harmonics.


But the dipole has the two independent sources on the two ends. The waves
from them are "coupled". We can say "polarised" but it not means that radio
waves are tranversal.

For frequency doubling to exist, there must be a nonlinear
process. The question is: Does any nonlinear process exist
between the linear transmitting antenna and the linear
receiving antenna?


Forget nonlinear process. In emmiting antenna the one current cycle produce
the two spherical waves from the ends (of course not in phase). So equipment
is "polarised" not the waves.
It is most interesting that at very short distances the polarisation works
and the frequency is not twice more.

I once heard a pile of tin cans talking to me. Turns out
some rusted junction in the pile of cans was detecting
the FM from the local radio station. That was a non-linear
process. Lucille Ball is reported to have picked up Japanese
CW signals through the fillings in her teeth, again a non-
linear process.


All are like coherer. The first detector of the radio waves.
S*

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Old May 18th 09, 12:36 PM posted to rec.radio.amateur.antenna
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Posts: 3,521
Default Frequency doubling

Szczepan Białek wrote:
But the dipole has the two independent sources on the two ends. The
waves from them are "coupled". We can say "polarised" but it not means
that radio waves are tranversal.


The "sources" of radiation on the two ends of a dipole
are not independent. There are coherent with the single
source. There is no way to superpose two coherent waves
to get a doubling of frequency. According to the math
model, all one gets is single-frequency interference.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com


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