Discussion in 'Working Different Modes' started by KC0BUS, Apr 2, 2019.
Not to the FCC.
Yes, a very slow one...
I have a digital antenna. And digital headphones also.
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.