[op25-dev] OP25 RPi Image

I finally had time to package up my OP25 system onto a ready-to-run image for an RPi3. This is based on the full Raspbian Stretch OS with GUI, so it's a 1.3 GB download. It's at http://febo.com/pages/os_images, along with a couple of other RPi images (one for an NTP time server, another that makes a bunch of RTL-SDR dongles look like a single Hermes HPSDR receiver). After downloading, unzip the file (it'll be a bit over 4GB) and write to an 8GB SD card. Stick the card in your Pi and wait for the desktop to appear. This system has Graham's (github.com/boatbod) latest code and if you happen to live in Montgomery County, Ohio, and have an HDMI monitor with speakers, you are all set to go. :-) Otherwise, you'll need to make appropriate edits to the config files and possibly change the sound settings. Enjoy! 73, John