[Elecraft] OT - RG6 dual coax as feedline?

[Jim Brown]

On Sat, 25 Apr 2009 17:29:15 -0400, Don Wilhelm wrote:

>My reason:  The paralleled line certainly will work, but the loss is the 
>same as a single coax of the same material, 

I don't agree, Don. Loss in coax at HF is all I squared R. If you match to 
twice the impedance, you'll have half the current. This means that the 
fraction of the loss in the center conductor will be 6 dB lower at the 
higher impedance. On the other hand, the loss in most coax shields is lower 
than the loss in the center conductor, so I would expect losses to be about 
3 dB lower, not 6 dB. 

>and in a multiband 
>situation, it certainly will be run at a high SWR. 

Agreed. This is not a good solution for antennas of random impedance. But it 
IS a good solution for antennas that match to about 2.5:1 or better. 

73,

Jim K9YC