At 2:40 this morning, Mountain time, I received an unusual prompt when I tried to check on a new signal from 103(b). I got the warning prompt that this test would interrupt "signal test". There was no channel number listed and the time it started showed 2:39AM. Since my HR20 is networked, I have to wonder if D* is checking signal strengths on select boxes. There was no signal on 103(b) at the time and I got the prompt that the unit was busy with "signal test" when I tried to change channels. I couldn't duplicate this after I reset the box.