Topband: Dual feed for Pennants

[Jim Brown]

On Wed, 24 Jun 2009 20:41:39 +1200, Greg - ZL3IX wrote:

>Several guys have told me that they have not managed to get this idea of 
>running the coax between the arms of the antenna, to work. I have also 
>realised that I would need two relays, or a 4PDT relay, as I would need 
>to isolate the grounds as well.

To take the coax out of the equation, you simply need to apply monster 
multi-turn chokes to the coax. See the Cookbook in my tutorial for winding 
details. In this application, I would try to achieve 10K impedance at 
frequencies of interest. This may require multiple chokes in series. No 
problem -- theyre cheap. :)  Just dont forget to include the length of 
coax wound on the cores when figuring the length of the feedlines for 
phasing purposes. The cores do NOT change anything -- the coax is simply 
additive. 

http://audiosystemsgroup.com/RFI-Ham.pdf  

73,

Jim K9YC