In my SIG Kadet Senior "near future" UAV, I've a nice feature in my video OSD: there's a RSSI connector to which one can apply a 0-5V tension and the OSD then displays a graph bar with RSSI signal strength. On Xbee side, I knew I had a RSSI output in form of a PWM signal on pin #6. I configured the Xbee RSSI/PWM0 timer to 99 (which translates in the Xbee to retain the last valid Signal Strength m…