• International Correspondence Schools, Scranton, Pennsylvania: Vacuum-Tube Detectors, Home Study.
    • 1955 booklet, by F. Malcolm Gager Senior Member Institute of Radio Engineers; Branch Head Naval Reseach Laboratory.
      • Amplitude modulation
      • Low-level detection of amplitude modulated signals
      • High-level detection of amplitude Modulated signals
      • Regenerative and heterodyne detection
      • Frequency modulation and demodulation pages

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