Radio Waves: BBC Transmitter Audio Feed, New DRM Receivers Showcased, QSO Today Virtual Ham Expo, and New German Class “N” Ham License | The SWLing Post
NATIONAL SEMICONDUCTOR Data Book 1980 48-Series Microcomputers Handbook | eBay
Op Amp Applications Handbook Walt Jung, Editor
CX (noise reduction) - Wikipedia
1980 NSC Audio & Radio Handbook - Part 2 PDF | PDF
SGS-Thomson Audio and radio IC's Databook, 1st edition, 1988 | eBay