I'm in the process of programming my 5955 servos. I've completed the aileron and rudder servos without any issues. I have a question about the servo on my elevator channel though. On low rates, the servo moves as expected throughout the entire travel of the TX stick. But, when I switch to high rates the servo does not move for the entire travel of the TX stick. With the stick in the neutral position, I give down elevator input and the servo moves through about the first half of the TX stick's travel but doesn't move through the remaining stick travel. Giving stick input for up elevator, the same thing happens. Again, this happens only on high rates.

I checked the TX pulse on the elevator channel with the programmer and found that on high rates the TX outputs' are 879 us and 2080 us. For comparison, the TX endpoint pulses on low rates are 1197 us and 1759 us. Since the programmer's Operation Manual says the normal endpoint parameters are 2100 us to 900 us, is the problem that one of my TX's pulse outputs on high rates is 879 us? If so, why does the servo's movement not follow the TX stick's movement in either direction since one of the TX's pulse endpoint values is within the servo's normal endpoint range? In order to have the servo move throughout the TX stick's full travel, should I program the servo's one endpoint value to be less than my TX pulse (i.e., 875 since the servo is 879)?

Thank you.

Dan

The pulse should NOT be a problem at 879us, or even much lower for that matter.

I'd try reprogramming the elevator servo, you never know.

Thanks, Michael. I tried resetting and then reprogramming the servo but get the same result. What else should I try?

Dan

Are you sure this is a 5955 servo verses a 5995 as this would make sense in this circumstance.

Can you try another servo on this channel to validate the servo is the culprit?

Yes, they are 5955s.

I connected my rudder servo to the elevator channel and get the same result. The servo for the other elevator half, which is running off a separate extension on an AUX channel (mixed with the elevator channel), also stops moving like the servo on the elevator channel when on high rates. It doesn't seem like a servo problem since all 3 do the same thing.(?)

Dan

As another test, I connected the elevator servo in question to my rudder channel, on high rates, and the servo moves as it should throughout the TX stick's entire throw. It looks like the servo itself is ok.

Dan

Another test - I tried a different RX and got the same result.

Dan

What is the end point setting on the radio and on the programmer?

When I program my 5945s for elevator servos , I used 130 on radio, and about 120 on the programmer. Set the neutral to 0 on radio as well.

Try utilizing another model memory maybe something is occurring in the mixing. Not being familiar with the TX in hand can you verify the MIX or D/R is not minimizing end-point percentages? However you did suggest the Programmer divulged the control signal was in the zone previously for High and Low rates when toggled; this is an interesting anomaly...

My TX's endpoints are set to 140% (I have a JR 8103 radio; goes up to 150%)

My programming values on this particular servo came out to be -88 and +110. My subtrims are all set to zero.

That did the trick. I programmed the elevator channel on a different model memory, and the servo's movement followed the TX stick's movement throughout its range on both low and high rates. Rather than programming everything in the new model memory, I copied the TX's programmed info from the original model memory into the new one. Guess what? The servo stopped moving part way through the TX stick's movement again when going to high rates. I cleared the elevator channel and the mixed channel on both model memories and reprogrammed the elevator channels but the servo still stopped moving part way through the stick's movement when in either memory. I cleared everything from the original model memory and reprogrammed everything from scratch. After doing so, the elevator servo and the servo on the mixed channel follow the stick's movement throughout its range on both low and high rates. Prior to clearing the original model memory, I went through each menu on the original model memory but didn't see anything out of order. When I reprogrammed the original model memory I used the exact settings that were there to begin with, so I'm not sure what exactly was causing it. There was something somewhere though given it isn't doing now, plus given it started doing the same thing when I copied the original model memory into the new model memory.

Thanks for the suggestion, Michael!

Dan