With QRP you can literally talk with someone across ... using a radio signal of constant amplitude and frequency that’s either on or off. CW radios are simple to build and simple to run, and ...

at least for modes like CW using FM or AM modulation. [Pete]’s interest was piqued when he read about a 10 mW 10 M QRP transmitter design in a vintage Radio magazine from the late ’50’s and ...