[TowerTalk] Station interference Stubs

[Jim Brown]

On 2/12/2013 12:22 PM, Mike Baker wrote:
> Stubs can do a pretty good job but for 160M the line losses will
> kill you.

NOT if you use the right coax. RG6 is a bad idea for this, but a decent 
RG8 or RG213 with solid PE dielectric will kill the 2nd harmonic by 24 
dB,  See specific recommendations, tuning instructions, and measured 
data  in the Coax and Stubs Q&A, link posted a few hours ago.  I haven't 
measured the attenuation of 160M by a shorted 160M stub on an 80M 
system, but interpolating from other measurements, I'd guess about 25 dB.

The W3NQN filters are first rate.  I recently finished a survey of all 
the contesting bandpass filters I could lay my hands on. Lots of 
measured data and analysis, as well as reports from several major 
contest clubs on reliability.

http://audiosystemsgroup.com/BandpassFilterSurvey.pdf