[ARC5] Impedance of an end-fed short aerial/antenna

[Leslie Smith]

G'day list members,

First, John advised that Yahoo e-mail accounts and passwords have been
compromised.  He included two links with more information, but it seemed
to me that one of the links was associated with the gang that stole the
passwords.  I didn't look too hard, and my "guess" may be wrong.  I
didn't visit either link, since (assuming a conspiracy) THAT VISIT might
cause more trouble on my PC.  As I said - I may be quite wrong ...  (BTW
I don't want my opinion on this passed on ... it's my opinion, and it
could be wrong, and I don't want wrong opinion passed on and on ...  If
I'm wrong - it stays here, ok?)


Second, there are many pages on the web that will calculate the proper
length for a resonant aerial.  (hehe - no antennae here - we follow the
"Brits" in how we use language).  

I'm interested in the load impedance of "off-resonant" end fed wires.
So - for example if I have a 35 foot length of wire trailing out the
back of an aircraft, what complex "Z" will that present to the 1625's in
the PA at, say 3.550 MHz.   What it the wire is 55 feet long?

Anyway, in the past I found a page that made that calculation - not for
an aircraft, but for an end fed random wire.  The calclulation allowed
for a good many parameters, eg the dia of the wire (1mm, 2.5mm etc),
height of the wire above ground and even soil type.  The calculation
result gave the impdedance as resistive and reactive components.

Having searched (googled) for about and hour or so - I can't find it.

Any pointers, clever types?

73 de VK2-land


Les

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