Has anyone used the GPIO lines on a URI to active a 12 volt DC fan when the PTT is active? I have a friend that who wants to implement this on his All-star node to keep his transmitter cool. I guess that we would need to use a relay with the GPIO line to protect the URI? Any thoughts or suggestions? Marshall - ke6pcv

Marshall, I had the same idea and I contacted David Kramer at DMK Engineering (makers of the URI). He responded with this link on how to do exactly what you want; http://www.dmkeng.com/images/GPIO_Relay.pdf I tried it and it works great.... 73, Neil WA5JXY