I recommend that you don't use the ten tec tuner (which I do use for
unbalanced feedlines, and it is very good for that--I am a big L network
fan) and instead tune the 600 ohm parallel line directly with a balanced
tuner such as the one made by Palstar. It uses a pair of synchronized
roller inductors and a single variable cap--each inductor is in series with
a side of the balanced line and the cap is between them and can be
switched between the high Z and low Z sides. Think of it as a pair of L
networks in parallel sharing the capacitor. The "balun" can be a 1:1 bead
or coax choke on the low Z side where the impedence is always nearly 50
ohms. I use this arrangement and it works great. Of course, you have to
work out a way to bring in the balanced line to the tuner but there are many
creative ways of doing this. We have almost exactly the same antennas for
I use a loop of roughly the same length, height and is somewhat a trapezoid
shape, fed in the middle of one long side.
73
rob / k5uj
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