G4ALG's QRP Radio Pages
[ Previously GW4ALG (QRT in February 2007) ] [ Home ] [ Antennas ] [ Equipment ] [ Introduction ] [ Links ] [ QRP Operating ] [ Station Summary ]
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I make regular use a narrow audio filter designed by the late Harry Grimbergen, PA0LQ. I constructed the filter many years ago.
Details of the PA0LQ audio filter can be found on my GW4ALG pages by clicking here.