[Elecraft] Random wires
Vic K2VCO
k2vco.vic at gmail.com
Tue Oct 1 15:44:13 EDT 2013
Another way to look at it is that it multiplies the radiation resistance, but does the
same for the ground resistance. So efficiency is unchanged.
On 10/1/2013 12:40 PM, Roger D Johnson wrote:
> 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
>>
>>
>
--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
More information about the Elecraft
mailing list