Category Archives: band pass filter

Second order Butterworth BPF

I decided that the broadcast breakthrough was just too strong to live with for my little direct conversion rig, Mrad-40.  I’d made a band pass filter (BPF) already, but it’s roll-off wasn’t stiff enough to knock down shortwave broadcasts, especially … Continue reading

Posted in band pass filter, Broadcast breakthrough, direct conversion, Mrad-40 | 1 Comment