[Elecraft] EC! competition: Balanced auto ATU

[Vic Rosenthal]

Don Wilhelm wrote:
> 
> Putting the balun ahead of the tuner and floating the tuner will not result
> in a balanced output!!!
> The result will be a balanced input to the tuner (due to the balun), but
> because the inherently unbalanced tuner design will not present the same
> impedance for each leg of the transmission line that follows it, the balance
> will be upset right at the output of the tuner.

The tuner circuit does not have to be balanced, but it needs to be symetrical
with respect to ground.  For example, a simple PI or T circuit can be used as
long as the components are not close to a metal chassis.  

73,
Vic, K2VCO
Fresno CA