Having botched multiple SD card adjustments, as well as other "internal" functions, due to very limited computer skills, can someone recommend a person or location to "lower the thresholds" to maximize my radio's sensativity, and recieving capability.One spare SD card which I loaded in to my laptop, showed "FATAL ERROR"upon re-inserting it into my PSR-800, and I am "clueless" as to how to repair, or reload the SD card, following this venture into scanner/computerland. Thanks to all, who will "help grandpa" ie:Me, get back a functioning reciever.