(Richard Harrison) wrote in news:24417-
:

John Smith wrote:
"The "major efficiency" you are stating is?"

Q is the usual statement of inductor efficiency.

Not to imply that Efficiency=Q.

In very simple terms, in the case of a coil, the inductance is
proportional to the cross sectional area of the coil. A circular coil
uses the least wire and hence the least resistance to achieve that area.
Techniques that increase the conductor length for the same inductance are
likely to produce a lossier (ie less efficient) inductor.


Libear loading has its advocates. My edition of John Devoldere, ON4UN`s
"Low-Band DXing" is from 1994. On page 9-36 is Fig 9-46, Two-Band (80
and 160-m) vertical system using linear loading to bring the antenna to
resonance on 160 meters.

Linear loading does have its advocates. The claims sometimes made
regarding efficiency are perhaps unjustified. My article at
http://www.vk1od.net/cobra/index.htm explores NEC based system models of
the Cobra antenna system (a linear loaded multiband antenna system) and
the loading mechanism is not inherently lossless.

The case of a non-inductive wire wound resistor is an extreme case of
inefficiency as a result of "linear loading". The objective is to arrange
the conductor so that incremental magnetising forces cancel and just the
loss is retained.

Owen