Reggie wrote:
When in the "+6" position, I do not get a true zero beat at the BFO
"-" position. It's still a relatively high tone.


Hi Reggie,

That just means that the BFO circuit isn't quite balanced, but it is not
really a problem. The +/-3 and +/-6 positions are there to allow you to
use single sideband using wider filters, and "higher fidelity" modulation.
(some examples of when you might do this are some of the fancier modulation
schemes used in data/fax transmission.)

I was concerned that your bfo might have been stuck +6 high, or -6 low,
and then when you were trying to zero beat on WWV, you would never
get there.

-Chuck