[Elecraft] K3: new feature idea / question

[Trevor Smithers]

G4ILO said
> you need at least two extra controls, preferably three, one to vary the
>phasing of the two signals and the others to adjust the amplitude of the two
>inputs so that the noise levels cancel exactly.

Sounds like a description of the DX Engineering NCC-1
http://www.dxengineering.com/Parts.asp?ID=1227&PLID=215&SecID=114&DeptID=12&PartNo=
DXE%2DNCC%2D1

Its expensive but if nothing else the manual is worth a read
http://www.dxengineering.com/pdf/NCC-1%20Rev%203.pdf

Trevor  G0KTN