[TowerTalk] Stub effectiveness

[Jim Brown]

On 5/6/2014 4:55 PM, Tom Osborne wrote:
> What determines the quality of a coax bandpass stub?

See k9yc.com/Coax-Stubs.pdf

First, a simple stub is not a bandpass filter, it is a NOTCH filter. 
Second,  what makes a good stub is low resistance.  The best material 
for HF stubs is an RG8 with a beefy copper shield.

> I found about half a spool of RG-6 at the local Goodwill store here 
> and it seems like it is pretty good coax.
>
> It has a triple shield - foil on the dielectric, shield, and another 
> foil shield on the outside, over the braid.  Would this make good stub 
> material?

No. It would be terrible. Resistance is too high.

73, Jim K9YC