[Elecraft] Random wires

[Ron D'Eau Claire]

The important value is the resistance at the feed point of the radiator,
independent of any matching devices used. 

Adding a 4:1 or other transformer is simply adjusting the impedance the feed
line sees, like any other matching network you might use. It has no effect
on the feed point resistance of the antenna. 

A 1/4 wave long folded radiator has a feed point resistance of 4x the
typical 1/4 wavelength radiator, quite independent of the ground system.
Hence the efficiency is higher. 

73, Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Roger D Johnson
Sent: Tuesday, October 01, 2013 12:41 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Random wires

This is NOT true! It merely raises the feedpoint impedance...just the same
as adding a
4-1 transformer.

73, Roger


On 10/1/2013 3:10 PM, Barry LaZar wrote:
>
>
>     As I read your post, I infer that at the moment you are wanting to 
> add 160 meters to your capability. An antenna that I have used and 
> liked is the Twin Lead Marconi. It's a simple, cheap, and effective 
> antenna. I first saw it written up by Bill Orr years ago. The premise 
> of the design is that a quarter wave antenna driven against ground may 
> not be the most efficient antenna due to low radiation resistance. 
> Therefore, raise the radiation resistance by using the theory of a 
> folded dipole. The folded element raises the radiation resistance by a 
> factor of 4 for 2 elements as the impedance changes as the square of 
> the number of elements. You will still need radials, but your ground
losses will decrease.
>
>
> 73,
> Barry
> K3NDM
>
>

--
Remember the Liberty (AGTR-5)
http://www.usslibertyveterans.org/
http://www.gtr5.com/

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html