The K3NG Keyer is an open source Arduino based CW (Morse Code) keyer with a lot of features and flexibility, rivaling commercial keyers which often cost significantly more. The code can be used with a ...

#define initial_speed_wpm 30 // "factory default" keyer speed setting #define initial_command_mode ... CCW #define initial_pot_wpm_high_value 35 // Potentiometer WPM fully CW #define wpm_limit_low 5 ...

Iambic keys came along and move the contacts to a horizontal position. If you ever see a HAM playing with his CW rig, chances are they’re using an iambic key. It’s great, then, that you can ...

That seems to suggest that CW signals occupy zero bandwidth since no information is modulated onto the carrier. But as [Alan] explains, the action of keying the transmitter imposes a low-frequency ...