I have some Belden 8213 (RG-11, fairly low loss 75 ohm). Could this coax be
used for stubs in a 50 ohm system?
73, Redd - AI2N
---- Jim Brown <jim@audiosystemsgroup.com> wrote:
> 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
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