[ARC5] Increasing selectivity - another suggestion.

[Kenneth G. Gordon]

On 7 Mar 2014 at 9:08, Bruce Long wrote:

> Another wild idea
> Inductive coil-to-coil coupling has the 180 degrees phase shift with respect to
> capacitive coil-to-coil coupling.  So in principal it is possible to reduce the
> net coupling by adding a small amount of capacitive coupling to a pair of
> inductively coupled coils.  I've see this mentioned in 1930's era radio design
> handbooks.

Thanks, Bruce. Now that you mentioned that, I remember that one of the ARRL 
Handbook receivers in the 1960s range used that method.

I'll have to dig out my handbooks and review that.

Ken W7EKB