[Antennas] balun question

Sun, 14 Apr 2002 22:24:11 -0400

Most 'encapsulated' baluns are of the 'voltage' type .. which, in
essence, is a transformer that looks like this:  [4:1}

------     <---High imedance connects here
C
C
C
C
------     <---GROUND [common point]
C
C
C
C
------     <---High AND LOW impedances connect here

Note that one-half of the 'transformer' is across the LOW impedance
[coax].
That's the reason you detected a 'short circuit' [probably using an
ohmmeter?].
Don - N8DE

John Geiger wrote:
> 
> I have a Van Gordon 4:1 balun that I use on my
> homebrew G5RV antenna.  It goes between the 300 ohm
> twinlead and the 75 ohm coax.  While doing some
> checking on my different coax runs this weekend,
> noticed that the coax for the G5RV is shorted between
> the center pin and the braid.  Traced the short back
> to the balun.  Is this normal for a 4:1 balun-to have
> the center pin and outside connector shorted, or did
> mine go bad.  Any feedback is appreciated.
> 
> 73s John NE0P
> 
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