I currently have an Igate setup with an old Windows XP computer. Old Pentium 4 and 1 GB of RAM. I just received a USB sound card and I'm still running into the same issue. I can received packets that are near by, around 12 miles or so but anything further won't be decoded by SoundModem. Signals will show up on the waterfall but nothing gets decoded unless you close. Eventually, the setup will be done with a Raspberry Pi (USB to serial and the USB audio device I already mentioned.) To link the radio to the computer, I'm using an EasyDigi I bought of eBay. I soldered everything myself with some oversight from another ham. I used cat5 cable to interface the EasyDigi to my Kenwood TM-281a. Everything works, PTT, RX audio and TX audio. It's just the RX rang sucks. My antenna is currently in my attic. I'm using LMR 400 cable, about 100ft of it, about 25ft too long. Any suggestions? I've tried adjusting the microphone audio with no luck.