So I received my new JR 12x radio this week and tried it yesterday on my Airstar Mongoose.

  I was already using the JR X9303 2.4 Ghz radio with this helicopter so all I had to do was rebind the JR R921 receiver with the 12x.

The first thing that I noticed that was different to the 9303 was the way the throttle trim works.  On the 9303, you can set your throttle curve to 0 if you like and the throttle trim can bring it lower than o to kill the engine.  On the  12x the throttle trim will only bring the  throttle curve to a minimum of 0, so you have to adjust your throttle curve to take account of this.

 The second thing, and of more concern was the number of fades and frame losses I saw reported on the Spektrum data  log I have attached to the receiver compared to the number I saw on the 9303.

 On the 9303 I would only ever see 1 or 2  fades reported on any of the antennas and no holds and rarely any frame losses,whereas on the 12x I saw in the region of 45 fades on each antenn,  10 holds.  Now although these are within what JR says is okay (between 50-100 fades are okay with no more than 500 on any one antenna and up to 20 frame loses in any flight) they were significantly higher than I got with the same setup, but using the x9303.

 The jury is still out on this subject to further testing.

 More to come.