I have a R921X and a 9303. I don't believe the Ant1 light should be blinking. If I'm correct that means its not connecting? What I had initially was a y harness going into the battery port on the Rx which went to two switches and then to the batteries. The one battery worked but the other caused problems. I got it from people on RCU that you could Y a battery into a JR Rx. There is something that I'm not understanding here and I wont be proceeding until I'm 100% sure this is correct. The radio is older and I have not used it before. It has the 2.4 module not the factory internal system. The Rx is new as are the batteries.

Dale

When is it blinking?

As for the batteries, you can Y them but I would run them into two different ports unless you have everything full.