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

[Mike Everette]

Actually... not quite so.

Check the rules for volleyball.

Reference the short out-of-bounds marker posts which are placed at the outside edges of the net.

In the rules, they are called: "Net Antennae."

X-IX-VIII-VII-VI-V-IV-III-II-I.... FLAMMA!  (catapult fires a II-fireball, I-hungry-lion load....)

"Incoming! Incoming!"

Actually let's get back to ARC-V Radio s et cetera....

73

Mike
W IV DSE

--- On Sat, 2/2/13, Michael A. Bittner <mmab at cox.net> wrote:

From: Michael A. Bittner <mmab at cox.net>
Subject: Re: [ARC5] Impedance of an end-fed short aerial/antenna
To: "Mike Everette" <radiocompass at yahoo.com>, "Leslie Smith" <vk2bcu at operamail.com>, "Brooke Clarke" <brooke at pacific.net>
Cc: "ARC-5 List" <arc5 at mailman.qth.net>
Date: Saturday, February 2, 2013, 12:25 AM



 
 



Except that in the USA, the Latin plural is reserved for the natural world 
while the anglicized plural is used for man-made antennas.  Thus, insects 
and crustaceans have antennae, while radios have antennas.  Reference Dr. 
John Kraus' seminal work on antennas appropriately titled " 
Antennas".   Now about "frame aerials", aka loop antennas.....
 
Mike, W6MAB

  ----- Original Message ----- 
  From: 
  Mike 
  Everette 
  To: Leslie Smith ; Brooke Clarke 
  
  Cc: ARC-5 List 
  Sent: Friday, February 01, 2013 8:35 
  PM
  Subject: Re: [ARC5] Impedance of an 
  end-fed short aerial/antenna
  
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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