Originally Posted by
Roelof
Did you check if the servo's are SR compatible?
SR is using the so called small band servo protocol which uses a center pulse width of 760 uSec, half the time than the 1.52 mSec normal servo's are using. Normal servo's expect such a pulse, when they do not get that, they do not understand. I do not know what the frequency range is of the NB4 SR mode but these smallband servo's are well used as an heli tail servo in combination with a gyro. These Heli servo's are easy to find and are mostly rated up to 500 Hz, not the 833 Hz SR normally is limited to.
I've not seen a servo rated for "SR". At best the only dead band info I can find is 1520uS/333 hz.
I'm starting to put the puzzle pieces together. Slow learner.... If the servo working frequency isn't rated for SR/SFR (833/1000) then it's not going to work if the radio is in SR/SFR mode.