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Is CW a true, pure digital mode?

Discussion in 'Working Different Modes' started by KC0BUS, Apr 2, 2019.

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  1. KQ0J

    KQ0J XML Subscriber QRZ Page

    Not to the FCC.
     
  2. W5LZ

    W5LZ Ham Member QRZ Page

    Yes, a very slow one...
     
  3. KA9JLM

    KA9JLM Ham Member QRZ Page

    I have a digital antenna. And digital headphones also.
     
    ND6M likes this.
  4. W9NPI

    W9NPI Ham Member QRZ Page

    CW is the label for the Continuous Wave mode. It was an improvement over the Damped waveform produced by spark transmitters that originally produced radio waves. Damped waves were known by the shape of a keyed pulse--a power surge that slowly died out. CW was an improvement, allowed something very close to a digital On/Off, and could be produced in at least 3 ways:
    1. Mechanically, with a high speed alternator, good to ~100KHz;
    2. As a continuous Arc (the radio wave needed to be shifted to another frequency as it was keyed--it was FSK;
    3. through a vacuum tube or transistor oscillator.

    All three of these modes could be Voice Amplitude Modulated, although Fessenden experimented with a modulated spark around 1901.

    --from W9NPI's lecture at AWA: History of Telegraphy, Part 2.
     
    K4AGO likes this.

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