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I have had a few discussions recently about SCA filters, switched capacitive audio filters,and how effective they are. The best way to demonstrate is by listening to recordings made with a variety of receivers. The first is a Small Wonder Lab Rockmite on 30m. The clicks/clunks are the sound of switching the filter in/out. This [...] I have just finished building a Small Wonder Labs SW+ 20. Nothing spectacular in that but using it for QSOs yesterday took me back to my first brush with radio. Around 50+ years ago I discovered a box of crystal set parts in my grandfather’s shed. After much haggling I was allowed to have them. [...] | ||
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