I have had issues with trying to monitor local Motorola Type II and LTR systems on my 436. When scanning, the scanner will skip over them like they aren't even there. I've checked multiple times to make sure that I have all the frequencies in correctly, and I do. Oddly, I have the same systems programmed into my 536 the same way and my 536 picks them up fine. For reference, here are the systems I'm talking about:
Texas A and M University College Station Trunking System, College Station, Texas - Scanner Frequencies
Skyline Communications (460 MHz) Trunking System, Bryan, Texas - Scanner Frequencies
Skyline Communications (850 MHz) Trunking System, Bryan, Texas - Scanner Frequencies
Texas Communications (College Station 460 MHz) Trunking System, College Station, Texas - Scanner Frequencies
Texas A and M University College Station Trunking System, College Station, Texas - Scanner Frequencies
Skyline Communications (460 MHz) Trunking System, Bryan, Texas - Scanner Frequencies
Skyline Communications (850 MHz) Trunking System, Bryan, Texas - Scanner Frequencies
Texas Communications (College Station 460 MHz) Trunking System, College Station, Texas - Scanner Frequencies