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Re: [TowerTalk] Stub effectiveness

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Stub effectiveness
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Tue, 06 May 2014 19:38:21 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
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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