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Old October 23rd 03, 06:23 PM
Tom Bruhns
 
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Cecil Moore wrote in message ...
David or Jo Anne Ryeburn wrote:

wrote:
It might help if the language was made more understandable. Isn't the
problem in getting an absolute ground reference point at the end of
the dipole?


Nope, that's not the problem. The language I am using is standard.


For you, maybe, but not for the average amateur radio operator. Instead
of trying to demonstrate how smart you are, how about trying to explain the
concept in words that the average amateur radio operator can understand?


How about:
1. Kirchoff's Voltage Law: The sum of the EMFs around a closed loop
equals the sum of the voltage drops around a loop. (It's commonly
MISstated as the sum of voltage drops around a loop is zero; it's much
better to distinguish between EMFs and voltage drops, as there are
EMFs which CANNOT be localized to one point in the loop.)
2. Faraday's Law of Magnetic Induction: For any closed loop, there
is an EMF proportional to the rate of change of magnetic flux enclosed
by the loop. (This is one EMF which cannot be localized--it just
drives the whole loop.)
3. Ohm's Law: Voltage drop is proportional to current times
resistance (so in a good conductor with modest current, there is very
little voltage drop).

From those, it should be obvious that the voltage you measure between
any two points depends on the path you take, in the presence of a
time-varying magnetic field (and perhaps at other times as well).
Didn't you previously post that you understood that?

As David has suggested, that set of three laws isn't the only way to
think about it, but I think they should serve the typical ham fairly
well; no integrals needed.

Cheers,
Tom
 
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