Any encryption that you may hear on the Edison Fire channels/talkgroups comes from the dispatch (headquarters) side; for some reason (politically motivated), the Fireground 1, 2 and Inspectors TG's are encrypted on that side only. Mobil units are in the clear. The best part: HQ can't switch that function off either (from what I've been told). Otherwise else, it's just simply interference that occurs on the digital side and then just repeats itself to the analog patch. Remember: this 3600 baud mixed mode system is one of the "first P25 systems" in the US, so "looks like they bought the one with the bugs in it."