Why did ham radio operators stop using AM?

Scan the 40 metre phone segment today and you won't find broadcast-style AM anymore — just thin, sharp voices that sound cut in half. That's not a coincidence. Every AM signal broadcasts the same voice twice, once in each sideband, plus a carrier that carries no information at all. All of that costs bandwidth and power for zero extra content.

Push an AM signal too hard and it doesn't get louder — it splatters into nearby frequencies. So amateur radio operators cut the fat: remove the carrier, remove one sideband, and what's left is single sideband (SSB) — the mode that actually runs the ham bands today. Same voice, a fraction of the spectrum, and roughly a quarter of the transmit power for the same range.

Understanding AM isn't optional if you want to understand SSB, amplitude modulation, sideband theory, or basic RF communication — SSB is AM with the waste cut away.

Save this for your comms binder.
Send it to someone learning ham radio.