I have the same doubts that you do about the radar gun. But it's the only thing I can think of.
The Spektrum would do it, probably, for these three 18-sized df models, but the larger stuff, I dunno. And I have 16 models ready to fly, so model program memories are definitely an issue. How many memories does the Spektrum have?

Also...the Futaba has never let me down before, the problem was only at FBF, and only yesterday...