Their FM station is a "translator" which listens to their AM station and rebroadcasts it. Translators are a secondary service that must only rebroadcast their primary service.
"Loss of primary station's signal. The translator must be set up to go off the air if the main station's signal is lost." [1] and cites regulations [2][3]
The main purpose of translators is to give AM radio stations an avenue (at lower cost than an FM only license) to reach listeners on the FM band and have a more consistent signal throughout the day — but they only keep that privilege if they continue maintaining the AM broadcast facilities as the primary signal.
There are issues with FCC public licensing to be certain, but the way a lot of stations deal with translators isn't quite above the board considering many stations attempt to follow the regulations (IMO).
Why would someone design a radio system this way (instead of independent signal to the FM) and what is the risk of running an FM station without rebroadcasting that lead to these rules?
> Translators are a secondary service that must only rebroadcast their primary service.
I must be missing something, because this seems an arbitrary rule that has no purpose except to increase the FCC’s licensing revenues by allowing them to charge more for “real” spectrum allocation that for a “translator” allocation.
The US Code of federal regulations, Congressional records, and media reports from around the time of enactment are on the public record, why not take a look yourself to check if you are ‘missing something’?
"Loss of primary station's signal. The translator must be set up to go off the air if the main station's signal is lost." [1] and cites regulations [2][3]
[1] https://www.fcc.gov/media/radio/fm-translators-and-boosters
[2] https://www.ecfr.gov/current/title-47/chapter-I/subchapter-C...
[3] https://www.ecfr.gov/current/title-47/chapter-I/subchapter-C...