Yes, that is what is happening with the FM band, CRAP CRAP CRAP CRAP CRAP and more CRAP and the FCC allows it!
The best stations out there are PIRATES. The local stations know this, the NAB knows this and so do the true listeners of terrestrial broadcasting.
It is time to shut down the NAB, they are nothing but money hungry animals that promote CRAP programming.
The FCC is another waste of Government money as they stand for the wrong reasons and wouldn't know a good station if it bit them on the ass.
Anyways, when a station gets a CP, that allows them to build their transmitter site and work out mechanical bugs and issues with ground faults while they are on the air, often at very low power until things are working properly, then they can increase their power output to that, that they are authorized to transmit at. That is why this station was silent and had a hum, they were working out some of those bugs that might be more obvious when a transmitter is in operation. Some equipment may need better filtering or grounding to avoid RF from the transmitter getting into the audio chain.
The thing that bugs me is we already have an over crowded FM broadcast band and they still continue to authorize more translators carrying the same programming making a utter mess of our public airwaves.
Expect it to get even worse as more and more AM stations fight to get in on the golden rainbow called FM radio.
There is not room for FM band expansion because when those FCC moron's get finished with the re-packing of the UHF televisions broadcast band to channels 14 through 21, VHF will go back to using channels 2 through 6 again. You can only fit so many people in this FM elevator and then you reach a limit and nothing more can be added.
We need to fix this broken Government and kick the FCC out the door and those NAB morons with them.
Bruce.