An R2-CW keyed with dots on 144 MHz. The serial number is 223.


The time domain waveform for the first key-down in a series of dots. White is amplitude, red is frequency. Something is going really wrong here. Maybe self-oscillations for a while?


The time domain waveform for key-up. White is amplitude, red is frequency. Oscillations like these are typically produced when a bandpass filter is first used to define the bandwidth and thereby the rise and fall times of the keying waveform and a subsequent stage is keyed with a similar time constant.


The time domain waveform for the second key-down in a series of dots. White is amplitude, red is frequency.