[Elecraft] Random wires

[Barry LaZar]

Everybody,
     I see a real problem here. Please someone open up the authority, 
Krause, and see what he says. His work is the basis of a whole lot of 
what we have today.

73,
Barry
K3NDM


On 10/1/2013 10:55 PM, Bob Cunnings wrote:
> Here's a link to the W8JI radiation resistance topic:
>
> http://www.w8ji.com/radiation_resistance.htm
>
> where the antenna efficiency issue is analyzed - using a 1/4 long
> folded radiator as the example. In this analysis the antenna efficiency
> is unchanged because total power and ground loss power terms remain
> constant.
>
> Bob NW8L
>
> On Tue, 1 Oct 2013 14:48:55 -0700
> "Ron D'Eau Claire" <ron at cobi.biz> wrote:
>
>> 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
>>
> ______________________________________________________________
> 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
>