On 9/11/2015 10:58 PM, gareth wrote:
"rickman" wrote in message
...
On 9/11/2015 1:48 PM, gareth wrote:
"rickman" wrote in message
...

There is no contradiction there. Current is not power. Power is
voltage
times current. Since the impedance of a short antenna is not the same
as
the impedance of a larger antenna, it makes perfect sense that the
current
for a given power level will not be the same.

Feed 1kW into your 472kHz antenna and get only 1W erp, most of
the high current driving the ohmic resistance and not the radiation
resistance

You have had this discussion with many others here before. What is your
point?

The point I was making was a courteous reply to you.

I'm talking about the technical point. Your reply doesn't have much
technical merit about the question you were originally asking. You
snipped the part I was replying to.

Therefore, to achieve the same radiated power from a short antenna, the
current
in the antenna has to be higher.

My point is that the current is not relevant in the theoretical case.
The ohmic losses you are talking about have to do with the construction
of the antenna, not the geometry. Make an antenna from a super
conductor with no ohmic losses and you will see the same power radiate
from both a short or a long antenna given the same power input to the
antenna.

There is my courteous reply to you, and fully on topic. Can you give a
valid technical reply about that?

--

Rick