[TowerTalk] Stubs

[Jim Brown]

On Tue, 17 Jul 2007 21:38:54 -0500, Gregg Seidl wrote:

>I always thought that the lower-loss cables have a deeper null.

Yes.

>I'm not sure why though.Maybe because the "Q" would be higher?

That's exactly right. The reason is that the stub works by putting a 
short circuit on the line at the frequency that it's tuned to. The 
lower the loss, the closer the value of the short is to zero ohms. 
That's also why a single quarter wave length is better than 3/4 
wave. And that's why the LMR-240 is not as good a choice as a big 
RG11 or RG8. 

73,

Jim Brown K9YC