I used the same noise antenna as I use for the ANC-4. I saw NO CHANGE in the noise level whatsoever when playing with the MFJ controls. I also took it apart BEFORE powering it up and corrected many solder errors and bad solder joints. What components I could I measured and all was well. But the circuit just didn't work. On my test bench, I hooked up the output to my Spectrum Analyzer and used clip leads as source and noise antennas. I watched the output as I ran a Dremel tool nearby (lotsa noise). NO REDUCTION whatsoever! And this was a BRAND NEW UNIT, just out of the box from HRO.
That was $200 flushed away! I ran the same tests on the ANC-4 and it DID reduce the noise!
I love my cats!
PHOEBE and PENELOPE MEW!