I've been googling the issue I've been having for a while now and others have also run across it. During the quest My radio transmitter is powered up and the radioman refuses to do his damn job. Any word on a patch or a fix?

Is anything red? You need to power the transmitter and a console, and make sure that the timer is not off if you are using the existing generators inside.

No the guy refuses to sit down and operate the damn transmitter, it's got a large generator hooked up exclusively to it so it has enough power also it's turned on its just the damn npc is bugged. I've tried EVERYTHING. Honest to god

And the console next to him has power?

You also have to set up a tower to call in settlers.

Already set up a tower for settlers and yes the [censored] is powered up

Under the http://fallout.wikia.com/wiki/The_Castle#Bugs section for The Castle

There's also a bug with the settler-summons bell I've heard about. If you build one and ring it, the radio man will come to the bell but there's a good chance he'll never return to his duties.