[Antennas] Balanced Tuners

Wed, 29 May 2002 21:27:09 -0500

Jan,
The Measures design is also shown in April, 2002, QST. I have built one to
tune a 136' center fed vee fed with 300 ohm twinlead. It has a coax choke
balun on the front end, and two roller inductors on the output of the choke,
with a capacitor across the output of the inductors. It tunes 80-10 meters
except for 30 meters and the low end of 80. Inductors are 20 mHs and cap is
a split stator 100 per section, actually 50 pfs. Best thing I like about
mine is that it has eliminated the RF in the shack that I used to experience
with my MFJ-969 tuner with the balun on the output side. Hope this is of
interest.
73,
Darryl, KK5IB

----- Original Message -----
From: "Jan Reimers" <[email protected]>
To: "Antennas Email Group (E-mail)" <[email protected]>
Sent: Wednesday, May 29, 2002 3:51 PM
Subject: [Antennas] Balanced Tuners

> A few people have recommended "balanced tuners" in the group discussions.
I
> assume this means that the balun goes between the radio output and the
tuner
> elements, rather than on the antenna side of the elements.  Is this
correct?
>
> If so then how are the tuner elements then arranged to keep everything
> balanced? (for the example a Pi network only has the inductor on one side
> and so the schematic appears unbalanced)
>
> 73
> Jan (VA7JNR)
>
>
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>
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