Hello, have a question... A friend and I have been discussing the difference between an AM signal modulated at 100% and a CW key. The AM transmitter would be modulated with a square wave, and the CW key would be turned on and off at the same rate. The debate is if the spectrum will look the same... In CW the carrier is turning on and off, but in AM the carrier is a constant amplitude with sidebands. He argues that the two are the same. Who is right? This thread https://www.physicsforums.com/showthread.php?t=79452&page=2&highlight=am+modulation touches the question, but still doesn't answer it fully, thoughts?