thunderbolt99

I noticed on the servo monitor screen when moving the throttle stick back/forward from -100 to +100 there is slight movement (~3 to 4 %) on a channel assigned to slider RS when the slider is set anywhere between the +40 to +70 location.

Calibration seems dead on in all controls and switches. Is this a defect or just a software glitch?

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FUTABA-RC

Let me play with mine and see if it does that. I'll get back. It could just be the fact that the sliders are not smooth but instead have a pretty stiff ratchet to them. You can open the TX and loosen a small screw on the slider to remove some of that tension. I'll get back once I see what mine does.

thunderbolt99

Thank you. Much appreciated. The slider feels ok. All controls do. It mostly seems to be a software issue as the RS slider gets no movement when operating the throttle stick.

FUTABA-RC

What is the channel you have assigned to the RS?

thunderbolt99

On a new model without any programming, I go to Linkage menu -> Function -> screen 2/3 ->Ch 7 Auxiliary 5 Control RS

thunderbolt99

So I just changed throttle from J3 to J2 and the problem is gone.

thunderbolt99

If I switch it back to J3 it comes back. Slight touch of RS to ensure it is set on notch also corrects the issue. You are right that maybe it has to do with tension on RS

thunderbolt99

Futaba-rc,
Have you been able to replicate this behavior?

I read a couple of posts on google for unwanted mix on other Futaba radios and like you mentioned before it seems that removing the back cover and relieving tension on the pots fixes the issue.

Do the top two hex screws on the antenna base need to come off to take the back cover out? Removing the 4 philips screws and the 2 small screws loosen most of the cover but it seems it is still held by the antenna base.

FUTABA-RC

Yes, I have. I have reported it up the line as well. Yes, you need to take the plastic part around the antenna off to open the TX. Take the 2 screws out and the part slides off over the antenna.

thunderbolt99

I think I got the unwanted mix fully removed. I loosened the throttle ratchet spring screw about 1/2 a turn. Then ran the calibration program and moved throttle up and down.

This definitely seems to be a software rather than hardware issue. It seems related to sensitivity of the RS pot. It seemed more prone when the RS was set between notches. Hopefully a future software update takes care of this issue. Also, it would be nice to have the calibration feature available for all pot controls (sliders and dials)
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FUTABA-RC

Interesting. That was my first instinct!. I'll play with mine now. Thanks for the tip!!

thunderbolt99

After looking at the servo screen a little more, I noticed the issue is still there just the range where RS makes it happen shifted and narrowed a bit. I even removed the ratchet springs from both throttle and RS to test and it is still there just barely noticeable.

I hope this is software related and can be fixed with a future update.

FUTABA-RC

I'm going to play around and see if the servos actually move or if perhaps this is some sort of display glitch.

thunderbolt99

Any news on this issue? Thanks

FUTABA-RC

I was able to replicate this with my 16SZ, but not my 18SZ, both run the excat same software. I have not received any feedback yet. But since they have been up to their necks fighting alligators while trying to drain the swamp the last 3 months, that does not surprise me.

I will bring it up again. I did not confirm if the servo actually moved however. I'll try that next.

thunderbolt99

Thank you for following up. I hope this is a simple calibration/software issue that can be resolved with a software update. I would hate to have to send it in after paying so much for this radio but will have to do it if Futaba does not adress it and my warranty gets close to run out.