Yesterday there was a major fire event in town about 1/2 mile from me. I was listening to the Old Bridge NJ trunked system on BOTH my BCD996P2 and also with SDRTrunk ( using the official RTL-SDR.com dongle ) on a PC. There was a LOT of fire department communication ( most of the time there is very little ). I noticed the BCD996P2 was hearing more traffic than the SDRTrunk? I paid close attention, and found the problem was the ' Fire General ' talkgroup, 727, which had lots of traffic on it. For some reason SDRTrunk was ignoring that group completely ( and YES in the Alias group it IS programmed to listen ). Why would SDRTrunk ignore this talkgroup? The BCD996P2 is having lots of simulcast problems, so I am relying on SDRTrunk.
