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Noise from RS232 serial connection to Ultradrive

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mini-mad View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mini-mad Quote  Post ReplyReply Direct Link To This Post Posted: 05 October 2017 at 11:06am
Could it be the rack itself? If you Isolate the rack ears of the amps from the rack strip does it still happen?

If it sounds like a gorilla is trying to escape, turn it down.
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colinmono View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote colinmono Quote  Post ReplyReply Direct Link To This Post Posted: 05 October 2017 at 11:10am
Originally posted by mini-mad mini-mad wrote:

Could it be the rack itself? If you Isolate the rack ears of the amps from the rack strip does it still happen?


I don't think so - I've tested driving an amp bolted into a different rack to the DCX, same problem. Of course all the amp chassis will be linked via their power lead earth connection even if they are isolated from the rack. Might try a few more tests to be absolutely sure.


Edited by colinmono - 05 October 2017 at 11:18am
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kedwardsleisure View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 05 October 2017 at 1:14pm
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colinmono View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote colinmono Quote  Post ReplyReply Direct Link To This Post Posted: 05 October 2017 at 1:20pm
Originally posted by kedwardsleisure kedwardsleisure wrote:

isolator

Thanks - will give one of those a try!
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colinmono View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote colinmono Quote  Post ReplyReply Direct Link To This Post Posted: 11 November 2017 at 2:53pm
Well it took a while to turn up, but at the price that's fair enough. The optoisolator did the trick, thankyou very much.

Somewhat weirdly when I first tried it there was still some noise. Added my butchered RS232 cable with the shield snipped at one end into the link and the noise went away. Took the butchered cable out again and hooked up with a standard cable again and still no noise... no idea how that worked, but so far so good.
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