How can I build a transmitter using radio waves with pulse modulation (Which I think [PM] means sine waves that either transmit or don't)? I can't find anything on how to build a PM transmitter, I can only find FM/AM ones, and I'm not smart enough to convert that information to the way I want. Also, I know that there are many laws concerning using AM/FM (and maybe PM?) radio without correct licensing because they might screw up other stuff, but would a PM transmitter do that? Any help will be accepted. Thank you!!