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
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