Serial Port SDR
> <i>This alone is impressive, but [Ted] isn’t done yet. He realized that this method of transmission was generating some strong frequency harmonics which extended far beyond the theoretical maximum 1 MHz frequency of his UART SDR.</i><p>i.e., blast noise all over the spectrum. There's a reason why real transmitters are more expensive than a serial port adapter.<p>This kind of RF pollution is illegal for obvious reasons and if you manage to disrupt something important (emergency frequencies, mobile networks...), it's gonna be expensive.<p>Don't try this at home!