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05-25-2007 03:39 AM  13 years ago
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rerazor

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Mich.

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Servo creeping-deadband help with Mini Pro 1
I have a Mini Pro 1 mount with Jr servos. I'm using my old Hitec Eclipse 7 tx for the mount. The servos creep and using trim and/or sub trim won't fix it. Is there anything I can use to fix this?

The Hitec Eclipse doesn't have a digital trim setting like my JR10x does.

Thanks.
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05-25-2007 05:33 AM  13 years ago
46Taylorcraft

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AZ

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I find that if I set the trim step to a very low value and then run alot of expo it allows for very fine trim adjustment near center.

not sure if you can do this on the Hitec (don't own one). There is a mod that you can do with analog servos to increase deadband... maybe it will work with digitals too, but keep in mind that increased deadband means less holding torque.
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05-25-2007 01:48 PM  13 years ago
rerazor

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Mich.

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I don't think the Hitec has the trim step feature.

Its a little frustrating when I fly solo and have to either run with the mount off or always correct it in flight (I need more thumbs).
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05-26-2007 02:04 AM  13 years ago
FCM

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Surrey, England

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What axis is creeping? If it is the pan then you can modify your JR servo to increase the deadband without worrying too much about holding torque.

If it is tilt then the best way is to use an external feedback pot on the tilt axis.

Paul.
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05-26-2007 02:09 PM  13 years ago
rerazor

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Yes the pan is the one that creeps the most.

Any links/info to adjust the pan dead band?

Thanks.
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05-26-2007 02:37 PM  13 years ago
MPA

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Australia

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For more deadband in the panning servo centre.

If you want to do a servo hack and can solder:
Here is a method I use in a post some time ago.
(instructions with pics)
http://runryder.com/t226966p1

Note for link, I use around 3nF cap these days with multiturn trims in the Tx for finer tunning, if trims are standard then you may want to use the 6nF cap in it.
Be aware the bigger the cap and wider the deadband also means a faster starting speed of the servo which is not so good for precise framing.

Done 2 types of servos but not JR.
But it is likely they are much the same hack.

Cheers
Dave
rvv.com.au
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05-26-2007 03:01 PM  13 years ago
AirFoil Aerial Systems

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IL.

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DJ is right and I think I talked to you on the phone. If you could set the trims to say 1 instead of 4 you could fine tune the mount and it would go away.

Look under Hobby Lobby I have had customers using 4 channel radios buy a inline servo regulator and it worked great. May check that out.

Hope that helps.

John
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05-26-2007 03:10 PM  13 years ago
MPA

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Australia

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Yeah if you can get the trim to do it for you on that Tx and it doesnt drift at all then thats better and simpler than a servo mod and the best place to start with it.

Cheers
Dave
rvv.com.au
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05-26-2007 06:35 PM  13 years ago
rerazor

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Mich.

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The Hitec Eclipse doesn't allow you to change trim rate.

Will check links out thank you.
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05-26-2007 07:08 PM  13 years ago
Smithprod

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Oklahoma

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One of the best things I ever did for my aerial work was buy a used 8103 for my mount radio...it solved a lot of problems. You can pick them up pretty cheap nowadays.

Brad
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05-26-2007 07:10 PM  13 years ago
46Taylorcraft

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AZ

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The Hitec Eclipse doesn't allow you to change trim rate.
but you could try dialing in alot of expo. trim usually comes after expo in the chain so dialing in 60-70% of expo should reduce trim steps at center.

try it and see.
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05-26-2007 09:52 PM  13 years ago
rerazor

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Mich.

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DJ,

I tried the expo same results. Scott had the same problem with his 9C on my mount but never had the time to adjust his trim rate.

Might be time for a new tx.
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05-27-2007 01:44 AM  13 years ago
MPA

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Australia

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Might be time for a new tx
If it came to that, Id go for the 6 cent capacitor in the servo and a few mins soldering.
rvv.com.au
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05-27-2007 03:27 AM  13 years ago
FCM

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Surrey, England

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Done 2 types of servos but not JR.
But it is likely they are much the same hack.
Done it on a JR 4231 coreless - worked just as Dave describes in his instructions.

Paul.
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05-27-2007 08:45 AM  13 years ago
MPA

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Australia

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I now recall you mentiing it worked Paul.
Glad to hear it.

Cheers
Dave
rvv.com.au
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05-27-2007 01:28 PM  13 years ago
rerazor

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Mich.

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If it came to that, Id go for the 6 cent capacitor in the servo and a few mins soldering.
I agree.
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