[R-390] Balanced input

[Gord Hayward]

The trimmer in each input coil set goes from one side to ground and 
there's a fixed cap from the other to ground.
Thus, if you use the described coax input and you get the wrong side as 
the centre, the trimmer will have no effect.
I like the balun idea, and the 75-300 ohm will probably be about right 
if the unloaded inductance inductance is high
enough.  Its on my "to do next" list.

Cheers de Gord, VE3EOS

-- 

Gordon L. Hayward, Ph.D., P.Eng.,
Associate Professor, Biological Engineering,
School of Engineering, University of Guelph,
Guelph, Ontaro, N1G 2W1.