How about breaking out the PTT from the URI and fire a small double pole relay.
One pole PTT to the radio, and the other to turn on the fan.
--
Robert A. Poff
Loganville, PA

WB3AWJ - Allstar 27784
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On Mon, 2012-01-23 at 16:59 -0800, Marshall Oldham wrote: 
Greetings, 

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

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