Fixes #8107.

The announcer again has its given name, rather than a randomly selected one.
The announcer now states its business, rather than talks about it.
The announcer now uses the proper frequency.

code/game/objects/items/devices/radio/radio.dm

@@ -167,10 +167,11 @@
 		return
 
 	var/mob/living/silicon/ai/A = new /mob/living/silicon/ai(src, null, null, 1)
+	A.SetName(from)
 	Broadcast_Message(connection, A,
 						0, "*garbled automated announcement*", src,
 						message, from, "Automated Announcement", from, "synthesized voice",
-						4, 0, list(1), PUB_FREQ)
+						4, 0, list(0), connection.frequency, "states")
 	del(A)
 	return