This is National Radio Institute booklet 20FR-3 "How Signal Currents are Kept in Correct Paths." It's another highly technical 29 page tome. Bizarrely the booklet opens with a plea for healthy eating habits. Then thankfully it segues gently into a long piece on simple condenser filters.Also covered: shielding, conversion error, grounding, EMI, RFI, magnetic fields, and all manner of hurdles to clear. The technical limbo bar peaks at the superheterodyne receiver as it rightly should.
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