Jim,
In this link:
http://www.hy-gain.com/man/pdf/BN-4000B.pdf
Read the note under figure No. 3
Strange, if it is just beads around a piece of coax.
David
HK1KXA
EC5KXA
> Date: Wed, 6 Aug 2008 23:08:14 -0400
> From: k8cc@comcast.net
> To: n3bb@mindspring.com
> CC: cq-contest@contesting.com
> Subject: Re: [CQ-Contest] HyGain BN4000 Balun Question
>
> Jim George wrote:
> > We will almost certainly be replacing a HyGain BN4000 one-to-one balun here
> > shortly with a WX0B one-to-one balun. It is important to get the "center
> > conductor" connected to the same half-element of the driven element in
> > order to maintain polarity and phase in a stacked yagi system of 205CAs.
> > Can one use an Ohmmeter to check which output lead of a BN4000 goes to the
> > center conductor of the PL259 and which lead to the shield?
> >
> > Jim George
> > N3BB
> >
> >
> > _______________________________________________
> > CQ-Contest mailing list
> > CQ-Contest@contesting.com
> > http://lists.contesting.com/mailman/listinfo/cq-contest
> >
> >
> >
> Jim,
>
> A lot of modern baluns are nothing more than ferrite beads strung on a
> length of coax inside the case. Those can be phase tested easily with
> an ohmmeter. But then again, some baluns are not. I use Radio Works
> baluns on my 5/5/5 15M and 5/5 20M stacks, and while I've never opened
> one of these baluns up to examine the internal design, the ohmmeter test
> seemed to work fine to get the phase right (i.e. feedline center
> conductor continuity to one side, shield to other, and no measurable
> resistance between).
>
> Maybe I'm paranoid, but I'd replace the baluns on both 205CAs rather
> than trying to match the phase between two dissimilar baluns.
>
> The modern baluns just work better and last longer. I've blown up my
> share of HyGain baluns over the years, particularly after the power
> limit went from 1KW input to 1.5KW output in 1983 :-( Never blown up a
> balun here at K8CC :-)
>
> 73,
>
> Dave
>
> _______________________________________________
> CQ-Contest mailing list
> CQ-Contest@contesting.com
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