OK, if you notice in my post wire length is in quotes, i.e. "wire length."
In the example, it is a given that this length resonates at 1/2 wave along
with the combined length of the whip (hence, electrical 1/2 wavelength.)

So, your post, while presenting individual points and your opinions, in
general--seems to answer very little, if any, of the original questions
raised--and certainly cannot be accused of containing any specifics.

The diameter IS stated (1"), the wire length is the lenght of the wire minus
28 inches which is necessary to be a resonate 1/2 wave, AND this is divided
over (1/4 wave at 10 meters - 28 inches.) to arrive at the coil length--the
pitch is calculated from the coil length ((1/4 wave @ 10 meters) - 28
inches) and the wire lenght divided by pi (number of turns) spread out over
the coil ENTIRE length. And, of course, coil length plus whip length is a
1/4 wave.

If you refer back to my original post, you will see all of this IS there...

However, critical analysis is a wise beginning of any quest for answers.

Regards



"Roy Lewallen" wrote in message
...
If you wind, say, 100 inches of wire into a coil, it doesn't act the same
as 100 inches of straight wire. And no two different coils wound from 100
inches of wire will act the same. A coil's radiation characteristics are
very nearly the same as for a wire the outside diameter and length of the
coil, not the length of the wire it's made from. And the inductance of the
coil is dictated by the length, pitch, number of turns, and diameter of
the coil, not the length of the wire it's wound from. So your question
can't be answered unless you tell us the diameter of the coil and any two
of length, pitch, and number of turns; or the length and diameter of the
coil and its inductance at the frequency at which it's being used.

Roy Lewallen, W7EL

John Smith wrote:
My question(s):

For an example, on the 10 meter band:
If I take a 28" whip and mount it at the end of helical wound coil (wound
on
1" diameter form), where the "wire length" of the coil, PLUS, the length
of
the whip (28" + coil wire length) is equal to 1/2 wavelength (electrical
length)--BUT, the overall physical length of the antenna (top, tip of
whip
to base of helical wound coil) is 1/4 wavelength, what would the
radiation
pattern of such an antenna be?

Would it favor the pattern of a 1/4 or 1/2 wave antenna--or, would the
pattern be a compromise between the two--or, would the pattern be totally
unrelated to either?

What could I expect the impedance of such an antenna be? Would the
reactance be capacitive or inductive? What would be the best way to
provide
a match to 50 ohm coax from such an antenna?

What software is available to model such an antenna?

Thanks in advance,
warmest regards