Originally Posted by vespa
Flashing red means your transmitter is not on. There are no error codes or anything else and unfortunately Futaba does not offer the critically valuable glitch counter like most other brands.
DJ, your antenna layout looks great, and range should be at least double the distance you can see - on the order of 1-5 miles depending on terrain and Wifi, and should be similar to Spek, though likely greater. I think you must have something on the quad causing interference but it could be a broken antenna wire or other issue. Try the RX in a plane and/or a different RX in the quad.
I'm going to try a different Rx, different S.bus cable and start there
John at Futaba said if it goes 1000feet there isn't anything wrong "per Futaba"