I have an RSP1A that works fine with UNO but I have a serious scanning problem. I have no limitation in listening 758 Mhz but if I want to scan between 758 and 800, it doesn’t work. MY TOP FREQUENCY IS ALWAYS 662,975,000 hZ. Where does that limit come from? I want to scan UHF up to 999.995 Mhz but it doesn’t work. Please help me.