Comment Re:You need this for an emergency (Score 1) 78
MW Propagation is a lot of fun. You can get stations that are thousands of miles away. Too bad younger generations haven't bothered to experience it.
It's a huge PITA for AM stations. Many AM stations actually have licenses that say they can broadcast from sunrise to sunset and must shut down for the night. Others have "reduced power operations" where they must reduce their transmit power overnight.
And others are lucky to have the full license that lets them go 24/7 at full power. The regulatory bodies have to consider propagation when dealing with AM radio licenses. When an AM radio station goes off the air it presents more headaches because the other stations nearby might have to juggle their power settings.
But AM radio being in the HF radio band means you only need a few stations to cover an entire country. In an emergency, you cannot tell how many transmitters you have available so the AM network means you still have a way to communicate even if stations so down. And some AM stations do not operate at full power as full power operation is reserved for emergencies.
In a scenario where a major city is impacted, nearby AM radio stations can often have coverage into that major city despite being far away (and thus not experience the issues) making it the ideal communications medium.
Plus, it also means the EV makers can't cheap out on radio shielding. ICE vehicles have huge issues as well with EMI causing radio issues, but they have had years to shield the radio from interference caused by the engine. ("Alternator whine" is a common one). The only reason EVs want to ditch AM radio is because their electronics interfere with AM reception and they want to save the $5 of metal to shield components.