ok i have 3 guys all runn castle sec's

4 mm
3 mmp

all of them will not hold a calibration with the radio after you trun them off and some time you have to turn the trim back just to get it to work and its like this every time you turn them on

it has done this with a 3 spektrum radio and 2 futaba radios


i have called castle and they say its the radio and its not and if it is then castle is crap as i tryed my dx3r pro, m11x and 3pks 3 brands and it still does it

Never had an issue with any Castle ESC (Micro, MMP or Monster) not holding its calibration with my Spekky DX3s

Cheers

the one guy is running a dx3s and it still dose it

Not saying this is the problem, but if you reset defaults you have to recalibrate. Other than that I have not had that problem.

I have 3, all over a year.

mine works fine with a dx3s and dx2s.

I'm just curious, when you changed the Spektrum radios did you change the reciever as well? Just a thought but try a different reciever or wait just thought of it did you setup a profile on the DX3R pro you used because before I setup and did up a proper profile on my DX3S it didn't save the profile settings on the transmitter either so when I turned it off it reset all my trims, endpoints etc. just thought that with a more complex controller it may need to be saved to the transmitter to keep it the way it was before turning the transmitter off. I'm rambling but it's worth a look at and hope it helps you.

i have used any the traxxas junk 2.4 ghz and a old 75 mhz futaba and not had a single issue after the initial calibration. I now have a futaba 4 pl and we will see how it goes. i run two mamba monsters and 0 issues

yes i changed the rx and tx at the same time still same thing