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Old June 25th 05, 09:21 AM
Ian White GM3SEK
 
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ml wrote:

then i think quantum things but even if i expertly understood all
these parts, would I have the answers??

You don't need to "think quantum things" about this problem.

The discovery of quantum physics was that energy levels aren't
continuous. A "system" (whatever it may be) can only have certain levels
of energy - in-between energy levels are not allowed. To change between
energy level, the system must emit or absorb quanta of energy.

Quantum energy E is related to frequency (f, Hz) by E = h*f, where h is
Planck's constant = 6.6 x 10^-34 Joule seconds.

At 10MHz, the quantum energy is 0.000 000 000 000 000 000 000 000 0066
joules. This is so small that - for all practical purposes - ANY energy
level is possible, and quantum effects at radio frequencies are so small
they are irrelevant.

So quantum physics has just *confirmed* that, at radio frequencies,
classical EM physics is all you need to know.


hey people thought people like einstein were nutz too and he was smart

The question is: are there any Einsteins here?

Antennas and transmission lines are home territory for classical EM
physics, right in the middle of our map of existing knowledge. There are
still lots of interesting new things to be discovered there; but we know
in advance that they MUST join up with the existing map, because it
surrounds us on every side.

Anybody who imagines he's an Einstein, exploring the outer boundaries...
is just plain lost.


--
73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek
 
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