Art wrote:
"Same question, but now look at distributed inductaance and how that
works!"

On page 2 of Terman`s 1955 opus is written:
"The strength of the wave mmeasured in terms of microvolts per meter of
stress in space is also exactly the same voltage that the magnetic flux
of the wave induces in a conductor 1 m long when sweeping across this
conductor with the velocity of light."

Remember reciprocity and the fact that only a perfectly matched antenna
can extract as much as half the power in the wave. The antenna`s
radiatiation resistance acts as a Thevenin source when receiving and
reradiates the other half of the power received but not delivered to the
load.

The description of magnetic flux inducing signal into a receiving
antenna may be the cause of describing transmitting antennas as creating
from current in the wire a magnetic flux around the wire which almost
simultaneously produces an electric field which almost simultaneously
produces a magnetic field ad infinitum.

Best regards, Richard Harrison, KB5WZI

On Sun, 11 Nov 2007 19:12:25 -0500, "Stefan Wolfe"
wrote:

There is nothing in "time constant" that relates to frequency, transient
rise time etc..

A Time Constant is also the -3dB point in a frequency response, hence
there is a frequency relation.

A Time Constant is proportional to square root of the rise time of a
transient, hence there is a transient relation.

It is not related. Ask any ham. That is my answer.

Find a ham that knows the answers (and it isn't Art).

73's
Richard Clark, KB7QHC

I spent a good part of my career as part of a team designing samplers,
step generators, TDR systems, and associated circuitry with rise times
down to a few ps. Among the projects I designed were two delay line
compensators which compensated for the distortion of a fast step by the
skin effect loss in transmission lines (one to 2 GHz bandwidth and the
other to 9, both to very high precision). These designs were used in
production Tektronix instruments. I also often helped the customer
support group with difficult TDR application problems, and I wrote and
taught several classes on TDR techniques. One of the many skills
necessary to succeed at this was to gain a very good understanding of
rise times, time constants, frequency responses, the relationships among
them, and the physical factors which influence them. From that
background, the discussion in this newsgroup seems to be taking place in
an alternate universe. I feel out of place there, so I'll leave it to
its usual and rightful inhabitants, and bow out.

Roy Lewallen, W7EL

Everything should be made as simple as possible, but not simpler.
-Albert Einstein