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
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