I've been pissing-off the local Cumulus engineer as I point out that everytime his HD 'goes down' on his full-power FM, he is operating his FM translator illegally, as their full-power FM's HD-2 is used as the official feed for the translator station; so he has to go thru the exercise of recycling power with his iBiquity system to bring the HD back online AGAIN.
I liked the old rule where the translator had to rely on an actual off-the-air receiver as the feed to the input of the translator, so if the HD-2 was gone, the translator would have not audio either. I wish that was the law of the land, and AM stations that want to have an FM translator should have to transmit a nice clean 10KHz stereo audio signal over the air, receive it at the translator and relay it that way. Lest, I dream again.