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I have an Icom F1000D that I've programmed to monitor my county's fire NXDN frequencies, but I'm not receiving traffic on some of the frequencies. I've tried various settings in the programming to no avail, and I've even been in contact with Icom tech support and they have no idea what the problem is. The frequencies I'm monitoring include the main dispatch frequencies (which I believe to be a multi-site conventional) and I can receive these just fine. But each fire department has their own "private" frequencies, and these I'm not receiving. I should note that I have a BCD996P2 with the NXDN upgrade and I can receive these frequencies on it, but not on the 1000D. On one of the frequencies that I can't receive on the 1000D, I started hearing another agency about 50 miles away. The RAN for the FD is different than the distant agency, but that doesn't matter because I have the radio set to receive regardless of RAN. I also note that when the FD is transmitting, the RX LED on the 1000D is illuminated but no audio. I'm at a loss as to what the problem is. I also have some other NXDN frequencies of other agencies programmed in which I'm receiving fine; analog works fine as well. I can't understand why I'm able to receive certain NXDN frequencies and not others. Any ideas?