Joe, Dan, and all;
I confirm Dec 84 QST includes an excellent article about traps constructed of
coax. I built a pair for 40M with RG-58 on 2.5" plastic pipe and they have
been in service since 94. The bandwidth is narrow (I don't have the figures
in hand), which implies high Q and low loss.
73
dan hearn wrote:
> Joe: I built a 15m coax trap to add that band to a trap vertical and it
> worked perfectly with no cut and try. The references at the end of ch. 7
> of the ARRL antenna book gives Dec 84 Qst as one article and I believe
> that is the one I used.
> 73, Dan, N5AR
>
> "Joe Subich, K4IK" wrote:
> >
> > Does anyone has a source of the equations for designing
> > coaxial traps ... and a source of RG-303 or similar coax?
> > I'm starting an antenna system project that will require
> > some traps and baluns. Coaxial traps may be somewhat less
> > efficient but look to be easier to work with on an
> > experimental basis.
> >
> > 73,
> >
> > ... Joe, K4IK
> >
> > ________________________________________________________________________
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