[Elecraft] Random wires

[Barry LaZar]

No. I expected someone who is an engineer and commands the language 
better than I to explain that they are not the same and how they fit 
together thereby adding a little enlightenment to this thread.

73,
Barry
K3NDM

On 10/2/2013 1:07 PM, David Gilbert wrote:
>
> What do you expect Krause will tell you?  That feedpoint impedance and 
> radiation resistance are the same thing??   I guarantee that it will not.
>
> Did you not understand that feedpoint transformations transform the 
> combination of all impedances present at that point, and therefore 
> leave the relative magnitude of the various components (and therefore 
> the efficiency of the system) the same??  Or are you somehow of the 
> opinion that a folded element is not a feedpoint transformation??   
> I'm really having trouble understanding your logic here.
>
> Dave   AB7E
>
>
>
> On 10/2/2013 9:26 AM, Barry LaZar wrote:
>> 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
>>>>
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