Thanks Jonathon. I went ahead and upgraded to the 472 and got it installed today. I only tested it on the ground - will have to test fly when it is a bit less windy than today. On the ground pulled out of the hangar so that I could get GPS signal through the GTN650 I was able to see a lot more of the traffic in the skies above me. However, it seems to blink and I will go from 10 adsb targets to 0 and then after a few minutes I would go back to 10 targets again. Any thoughts on what would cause that sort of blink? I checked the connections from 472 to SV-XPNDR-261 and connection to the ACM control module and they were all solid and not loose. Would the pin 3 ohms resistance manifest like that?