RE: Is a choke required between an ESC and receiver?
Terry, my experience here with similar to what you are going to be using.
I fly Airtronics. Never had any interference problems.. I fly the Dualsky 11T right now with the Jeti 90. I recently changed out to a newer Jeti 90 esc, and got locked out 2 to 3 flights per trip to the field. Nearly lost my Abbra several times. I changed back to the old esc, and have had no problems since.
Now this other esc had several flights in another plane with no problems ever. Strange, I know. Not sure I will choke it in my next plane, but I will if I need to..
Chris