[TowerTalk] Fwd: Open wire choke?

[Jim Brown]

On Tue, 29 Sep 2009 14:34:14 -0400, hanslg at aol.com wrote:


> How said the ladder line can't be equipped with a bal/un choke. I 
made one by winding two wires next to each other on a 4" PVC pipe. I 
had some 25 feet of wires and basically made a 1/1 transformer. 
Right connected you will have introduces a nice decoupling inductor 
in line with the ladder line. Needless to say I build my own ladder 
line out of #14 wire and 4" spacers (spaced 9" apart). Gives you ~
400 ohms line. In my case I am feeding a windom antenna, cut for 80 
meter and up. (Works OK on 160 meter too).

>Losses? Probably, but most stations hear me when I am calling bare-
footed, the conditions are OK and no pile-ups.


Your definition of a GOOD common mode choke is very different from 
mine. See http://audiosystemsgroup.com/RFI-Ham.pdf  Yours will do 
VERY little. Mine will do a LOT.

73,