[600MRG] QEX Noise Canceller

[Frank Lotito]

Has anyone tried the noise canceller circuit presented in the Jan / Feb 2012 issue of QEX? Specifically, for the 600 / 630 meter bands?  The article by Fred Brown, W6HPH, is titled "End Man-Made Noise with the Noise Canceller," pages 12 through 14.  The author alludes to tailoring the design for the frequency band of interest.  The QEX article presents a 75 meter design.
 
73 Frank K3DZ / WH2XHA