Some may not know that translators have no minimum HAAT(Height above average terrain) In other words, stations (translators) such as the new WAMO on 100.1 are operating at 925 feet above average terrain. This phenomenon has spread nationwide, with some operating at 2,000 feet or higher above average terrain. They are using the call signs for the AM station, and programming like an FM station. Some people don't even know they are a translator, as they are permitted to re-broadcast the AM stations signal. My company has been hired to investigate interference issues with such translators. Some 99 watt, and many 250 watt translators have signals that rival Class A stations. These things are popping up all over the place, again, "to rebroadcast an AM station"
The one thing that many may not know is translators cannot interfere with "any" reception area of another commercial or non-com station. So any regular listener is protected, no matter if they are in the protected (60dBu) contour or not. The burden is on the plaintiff, so the first step is to determine the listeners are in a receivable area. This is done by two methods, field strength and a spectrum analyzer. Demodulated audio is recorded and synced with the spectrum analyzer out to a laptop. The FIM and the spectrum analyzer both record the signal strength of the translator. A special directional antenna is then used to null out the translator and record the plaintiffs signal. This verifies the listener is in an actual "receivable" location, even though the rules do not call for this proof. Hopefully this helps anyone that may wonder "how in the hell some of these translators are reaching out so far?