"Cecil Moore" wrote in message
. net...
Steve N. wrote:
...if you get my drift.
Steve, I put "missing" in quotes because there is no missing part of
the antenna.
I think I understand your intent. What I say is drop the following
sentence:
"I've been saying for months that a 75m mobile antenna
doesn't have to be 90 degrees long to be resonant.
Forget electrical length discussions in regard to anything but a single
transmission line piece. I don't think it makes any improvement in
understanding what is going on to add talk about something you want to call
the electrical length of a complex system of lines and components. I think
it adds unnecessary complication. My opinion is that this is taking a
concept used in transmission line discussions and applying it where it is
not needed.
Though I didn't verify your math on the original example, I don't find the
type of result surprising and doing he math is all that is needed. I would
not have expected that the "degrees" of electrical length to add up to 90,
or whatever an equivalent antenna or t-line length would have been. I do
understand the desire to form what I call a "mental model" which allows us
to understand how things work so that we can use them. Lord knows that
waves need some kind of help to get them into our minds so we can feel
comfortable about how this all fits together. In fact, sometimes I get the
impression these discussions become a battle between two mental models that
may work for the individual posters, but don't fit into the other's model
and many words ensue trying to pull each other over to the other's mental
model paradigm.
Talk such as the following it sufficient. (although I'd have to think about
the specific thing you say here since I don't think about transmission line
things in those terms)
All that is
required is that (Vfor+Vref) be in phase with (Ifor+Iref) where
those are phasor additions. ...detail snipped
-- 73, Cecil http://www.qsl.net/w5dxp
Whatever lights your fire. It is fun reading some of the discussions,
though
73, Steve, K9DCI