On Dec 2, 2:46 am, wrote:
On Dec 2, 12:19 am, "AI4QJ" wrote:

"AI4QJ" wrote in message
The location on the monopole may make a difference. Since a standing wave is
present, the location on the antenna will define the amount of current in
the coil. Mounting near the feedpoint is at a high current point and this
will increase ohmic losses. At approximately the center of the whip, the
current (and ohmic loss) will be minimal. However, more inductance will be
needed in the center location. thus more wire. More wire means more
resistance. In spite of that, many say that the most efficient location is
at near the center of the whip and intuitively I think this generally
correct as long as you use heavy wire.

BTW, if you raise the coil, you generally will see maximum current
at the coil, not at the base.
This is another thing that bothers me about the taper/delay theory..
Myself, I think the usual "short" loading coil acts pretty much as
in lumped theory. To me, it acts more as a single unit, rather than
the many feet of wire acting as a mere extension to the whip.
These two things kind of blow the "90 degrees of wire theory"
in my mind at least..
If that were the case, you would think the amount of wire, coil turns
should stay the same no matter the location. But also, even with the
physical length of wire being coiled up, I would also still expect to
see maximum current at the base of the whip, same as a 1/4
monopole.
But this is not the case. Seems to me it's been shown many times
that if you elevate the coil, the current distribution is fairly
linear
up the lower whip, and you will see a slight current maximum at the
coil, not at the base.
I don't think you would see that current max at the coil if it were
not acting pretty much as a lumped inductor.
But thats just my take part 2..
MK