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

[Mike Everette]

For the record:

ANTENNA is singular; one antenna.

ANTENNAE is plural; not two antennas, but rather, two antennae.

It's from Latin.  (I took Latin in high school; this is one of the few things I actually remember....)

73

Mike
W4DSE

--- On Thu, 1/31/13, Brooke Clarke <brooke at pacific.net> wrote:

> From: Brooke Clarke <brooke at pacific.net>
> Subject: Re: [ARC5] Impedance of an end-fed short aerial/antenna
> To: "Leslie Smith" <vk2bcu at operamail.com>
> Cc: "ARC-5 List" <arc5 at mailman.qth.net>
> Date: Thursday, January 31, 2013, 10:39 PM
> Hi Leslie:
> 
> This web page and those it links to may answer your
> question.
> http://personal.ee.surrey.ac.uk/Personal/D.Jefferies/radimp.html
> 
> In general a length of wire that's shorter than 1/4
> wavelength is a small value capacitor
> 
> Have Fun,
> 
> Brooke Clarke, N6GCE
> http://www.PRC68.com
> http://www.end2partygovernment.com/2012Issues.html
> 
> Leslie Smith wrote:....
>  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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