RadioBanter - View Single Post - Current across the antenna loading coil

April 20th 06, 03:08 AM posted to rec.radio.amateur.antenna

wrote:
I can't believe you are still trying to get Cecil to actually read the
paper he is misquoting.

Unfortunately for your lumped circuit religion, I am not
misquoting anything. Page 4 contains a test to see if a
coil falls within the limitations of the velocity factor
equation. A 75m bugcatcher coil is less than half the
upper limit.

Here's the calculation: 5*N*D^2/lamda 1

N is turns per unit length and D is the diameter.

5*48*0.5^2/246 = 0.24 1

Therefore, the graph in Fig. 1 is valid for
75m bugcatcher coils and the velocity factor is around
0.02. The VF equation yields the same value as the graph.

The lumped circuit model is known to fail. Dr. Corum knows
where it fails. Most people on this newsgroup don't know.
And when it does fail, the distributed network model gives
valid results.

Why would you ever choose a model known to fail without
knowing where it fails when you could be using a model known
to be valid?
--
73, Cecil http://www.qsl.net/w5dxp