[TowerTalk] KLM Balun Phasing Marks

[Logan Dietz]

Isn't there a dc connection from the center conductor of the coax connector
to one of the terminals and not to the other?

Chuck, W5PR

----- Original Message -----
From: "dan hearn" <dhearn@ix.netcom.com>
To: "Bill Tippett" <btippett@alum.mit.edu>; <towertalk@contesting.com>
Sent: Tuesday, April 10, 2001 12:53 PM
Subject: Re: [TowerTalk] KLM Balun Phasing Marks


> Bill: I would connect the inputs in parallel and apply an input signal
> from a MFJ 259 or sig generator. You could put the two outputs on 2
> channels of a dual channel scope and observe if the 2 traces are in
> phase or out of phase. I think you could even connect the 2 outputs in
> series and create a very simple r.f. voltmeter with your VOM, a 1N34
> diode, and a shunt capacitor. The connection with the highest voltage
> would mean the outputs are in phase. I haven't thought real hard about
> it but think it would work.
> 73, Dan, N5AR
>
> Bill Tippett wrote:
> >
> >         I have 3 new KLM 4:1 baluns purchased with KLM-610 Monobanders
> > last fall.  While doing some preventative maintenance, I noticed one of
the
> > connection studs broke clean at the outside of the nut against the PVC
case
> > (so there is no way to make another connection).  I also have an old KLM
> > Balun circa 1980's which I can use as a substitute if I can determine
the
> > proper phasing connection.  Note...both baluns are the same construction
with
> > a PVC tube and end caps...not the old old (skinny) baluns from the
1970's.
> >
> >         Looking at the newer baluns with the label on top as you look
from the
> > connector end, the phasing mark is on the right stud.  However, on the
older
> > balun looking the same way (label on top viewed from the connector), the
> > phasing mark is on the left stud.  Does anyone know if KLM was
consistent with
> > their phasing marks over the years?  Has anyone mixed new and old
baluns?  I
> > am tempted to assume the phasing mark is correct but it bothers me that
it is
> > in a different position relative to the label.  M2 says there is no
simple way
> > to tell the correct orientation without taking the baluns apart and
visually
> > inspecting both.
> >
> >         Which brings me to my next question!  Has anyone disassembled
one of
> > these baluns?  It appears you can do so by undoing the locknut on the
coax
> > connector and knocking the end cap off.  This may be the easiest way to
> > check for proper phase of the two baluns but I would like to hear from
anyone
> > who may have done this before I start tearing both apart.
> >
> >         Better yet, does anyone have a better idea?  I suppose I could
remount
> > the antennas and check for gain when the two lower ones are selected but
am
> > open to any ideas.
> >
> >                                                 73,  Bill  W4ZV
> >
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