I'm using DSDPlus FL monitoring a Cap+ system with 2 sites. each site has only 1 Freq and the FCC says that there are only 2 Freqs for this user. I have excellent reception of both sites. I've set up 2 DSDPlus instances in 2 separate folders to monitor both sites simultaneously. Over a 24 hr period a Ch4 popped up in both Activity Windows. I didn't observe when it happened and checking the log files it doesn't show any Ch4. It doesn't show a Ch3 (yet). Is it possible there is another frequency in the system (there would have to be 2, one for each site) that is not licensed, or is this an anomaly with DSDPlus?