[Pete Juliano, N6QW] built a 20 M QRP CW transmitter using just a handful ... output 10 mW at frequencies up to 30MHz. [Pete]’s rig was originally putting out 0.4 mW with a 3 V supply, and ...

Generally, any radio capable of transmitting at 5 watts or less would be considered a QRP rig, although some argue for anything below 10 watts. In the end these limits are academic, because most ...