"Richard Clark" wrote in message
...
On Sun, 09 Oct 2005 03:39:32 GMT, "Frank"
wrote:

Axial extension 1.2" from antenna end -- Results as follows:

Extension Length (ft) Resonant Freq. (MHz)

0 3.5765
5 3.576
10 3.575
20 3.574
50 3.5725
100 3.5720

For a total shift of 4.5 kHz (0.125%) from zero to 100 ft

Hi Frank,

Thanx.

Was this for a coaxial line running from the drivepoint, then parallel
to the lower leg, down? Was the parallel separation 1.2" as you
describe above?

Was this line modeled as a third wire connected at the drivepoint and
dropping as I describe?

73's
Richard Clark, KB7QHC

Hi Richard,

My model is only valid providing the coax has no current on the exterior of
the shield. All I did was extend one leg of the dipole by the length
specified, but not actually connected to it; with a 1.2" gap. As per the
following sketch.

----------o---------- ----------
dipole extension

Do you think it makes sense? It is the only way I could think of modeling
it with NEC.

73,

Frank