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Servo /RX incompatibility?

Can anyone explain this?

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Phil B03/03/2019 16:32:45
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I have 2 Graupner C341 servos, in a glider. They both worked fine with a 35MHz JR rx. I think they were made by JR. Similar to Hitec Hs 81s. They both respond fine on a servo tester. But when connected to either a Graupner GR12 rx or a Spektrum 610 rx, both 2.4GHZ, they have no response at all. If another digital servo is connected to the rx it works fine and the analogue servos occasionally twitch when the digital operates on an adjacent channel. Can anyone explain this? Are some analogue servos incompatible with modern rxs?

Steve J03/03/2019 16:37:24
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The AR610 only puts our 3.3V on it's signal line. I don't know about the others. It may be that the C341 needs more than that.

Steve

Mr.B.04/03/2019 18:35:07
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I had analogue servo twitching issue with an AR9030, updating the firmware fixed it. Spektrum don't put this in the manual.

Edited By Mr.B. on 04/03/2019 18:35:48

Steve J05/03/2019 09:44:59
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Posted by Mr.B. on 04/03/2019 18:35:07:

I had analogue servo twitching issue with an AR9030, updating the firmware fixed it.

That would be the Spektrum 'T' receiver 11ms bug which meant that the affected receivers always had a servo frame rate of 11ms which is a problem for some analog servos.

Steve

Edited By Steve J on 05/03/2019 09:45:47

Phil B05/03/2019 11:52:42
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My Graupner rx has a programmable frame rate, either 10 or 20ms. I have it set to 20ms. Still no response from the (JR) graupner servo. The same with a Spektrum 610 rx.

Chris Bott - Moderator05/03/2019 13:33:30
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Signal boosters do exist from various suppliers. Here's one example.

Stephen Smith 1405/03/2019 18:40:55
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Posted by Chris Bott - Moderator on 05/03/2019 13:33:30:

Signal boosters do exist from various suppliers. Here's one example.

Would be great if it wasn't discontinued

Chris Bott - Moderator05/03/2019 20:03:48
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Posted by Stephen Smith 14 on 05/03/2019 18:40:55:
Posted by Chris Bott - Moderator on 05/03/2019 13:33:30:

Signal boosters do exist from various suppliers. Here's one example.

Would be great if it wasn't discontinued

Well it was meant to show that there is such a thing.

Google isn't too hard to use, what about this one?

Sparks05/03/2019 22:04:38
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Hi Phil,

Have you checked what servo frame rate your transmitter is set up for?

On my Spektrum DX8 you can set a frame rate of 11ms or 22 ms.

The older Analogue Servos require the slower frame rate of 22ms.

The newer Digital servos are happy with frame rates of 11ms or 22ms, but give a faster response with a frame rate of 11ms.

On the DX8, the frame rate setting can be found in the 'system setup' menu.

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