On Dec 3, 3:08 pm, Cecil Moore wrote:
K7ITM wrote:
I thought you said you can
calculate the phase change in a particular situation, and were willing
to do it. Is the description of the system lacking in some way?

I have no idea what "system" you are talking about.

That's a continuing problem you have when you cut off the important
parts of postings you reply to. Though it's your problem, not mine,
I've obliged you by repeating the description at the bottom of this
posting.


It's not a rocket science concept, Tom. One degree of
an antenna causes a one degree shift in the phase of the
traveling waves. If you disagree, please enlighten us.
--
73, Cecil http://www.w5dxp.com

Cecil, I posed two very specific examples for you to work out to show
us that you can actually correctly find the phase shift for travelling
waves, as you promised you could and would. I would just like you to
deliver on your promise. The specifics are repeated below--though
you'd really help that short term memory loss thing if you would just
quote the whole posting you're replying to, instead of always cutting
off the meat. If you don't want to deliver, just say so and I'll
leave you alone.

"OK, I live in a very cold environment (freespace) and I've discovered
I can make and use high-temperature superconductors here, so I can
wind very small coils that still have high Q. In fact, the Q is
practically infinite, even for small coils. I've made a dipole from
0.1 inch diameter wire, 16 feet long total (192 inches). Four feet
from each end I've put a coil of about 390 turns (gets a bit hard to
keep track of the count) of very fine wire in a helix 0.1 inches
diameter and 0.2 inches long. This seems to give me resonance at
3.9MHz, though a rather nasty low feedpoint impedance. Master guru,
can you tell me please the travelling-wave phase change from one end
of one of those coils to the other end of the same coil, at 3.9MHz, in
the described environment? And can you tell me why I should care
about that?

"I'm also experimenting with capacitively loaded long antennas, and I
have another dipole that's 180 feet long, also made from 0.1" diameter
wire. I've put tiny capacitors 45 feet in (25% of the total length)
from each end, and adjusted them for resonance at 3.9MHz. This yields
a much easier to feed feedpoint impedance. They are, like the coils,
the same diameter as the wire, and about 0.04 inches long. Master
guru, can you tell me please the travelling-wave phase change from one
end of one of those capacitors to the other end of the same capacitor,
at 3.9MHz, in the described environment? And can you tell me why I
should care about that?

"(And how about trying to surprise us all, and quote and answer the
whole thing, not just some select part, huh?)"