Where can I find a schematic for a noise canceller for HF? I would like to homebrew a noise canceller/preamplifier that would be similar to the MFJ-1026. (Unfortunately, the MFJ manuals available online don't include the schematic.)
I would particularly appreciate an explanation on how the various parts of the circuit work (noise amplifier, noise phase shifter, signal preamplifier, filters, etc.) and the transformer specifications I need (so that I can use something available to me).