I'd be one of the people arguing. Radiation resistance fits every
definition of resistance. There's no rule that a resistance has to
dissipate power. The late Mr. Carr was quite apparently confusing
resistance with a resistor, a common mistake.

Why not call radiation resistance "real" resistance and loss resistance
"ficticious"? Makes just as much sense as the other way around -- that
is to say, none.

Roy Lewallen, W7EL

Dr. Slick wrote:
W5DXP wrote in message ...

Dr. Slick wrote:

"You cannot tell if the 50 Ohms reading on a Network analyzer into
a Black Box is a dissipative resistance like a dummy load, or if it is
a radiated resistance of a perfectly matched antenna. You don't have
that information."

Conversion of RF energy to heat can be measured. Conversion of RF energy
to EM radiation can be measured.



Agreed. But a Black Box to me implies you have limited
information from it. My point is that if someone gives you an
impedance plot of a resistive 50 Ohms, you will not be able to tell if
it is dissipative (lossy) or radiated resistance.

I was just reading that Joseph Carr calls radiated resistance as
a sort of "ficticious" resistance. I'm sure many here would argue
this description, but it kinda makes sense to me.


Slick

Roy Lewallen wrote in message ...
I'd be one of the people arguing. Radiation resistance fits every
definition of resistance. There's no rule that a resistance has to
dissipate power. The late Mr. Carr was quite apparently confusing
resistance with a resistor, a common mistake.


Your point has been well taken, Roy. But you have to admit that
radiation resistance is not a easily understood concept (which is why
it may be a common mistake), so for someone to call it a "fictitious"
resistance can make sense, in the sense that it is not a dissipated
resistance. After all, "Imaginary" numbers are well accepted. And
from an arguing sematics point of view (which is unfortunately
necessary sometimes), even you call it "radiation resistance", which
means that it is obviously not the same thing as a dissipative
resistance like a 50 Ohm resistor.

That being said, rest assured, Roy, that you have convinced me!



Slick

Roy Lewallen wrote in message ...
I'd be one of the people arguing. Radiation resistance fits every
definition of resistance. There's no rule that a resistance has to
dissipate power. The late Mr. Carr was quite apparently confusing
resistance with a resistor, a common mistake.


BTW, did Joseph Carr really pass away? Sad, his book is very practical.


Slick

Yes, he died not long ago, within the last year I believe.

Roy Lewallen, W7EL

Dr. Slick wrote:
Roy Lewallen wrote in message ...

I'd be one of the people arguing. Radiation resistance fits every
definition of resistance. There's no rule that a resistance has to
dissipate power. The late Mr. Carr was quite apparently confusing
resistance with a resistor, a common mistake.



BTW, did Joseph Carr really pass away? Sad, his book is very practical.


Slick