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Eddy Currents



Joined: 20/11/09
Posts: 68
Weird Metronomic clicks from dodgy Xlr Cable ? new
      #1019069 - 17/11/12 08:48 PM
Hi,
Had a very strange symptom occur today I've never come across before and wondered if some kind member of the forum might have an explanation of what was actually happening.
Maudio interface plugged into Radial passive Di and then connected via an xlr to xlr cable into a Mackie analogue mixers mike input. (Phantom Power was off)
Weird metronomic clicks started to occur a few hours into our rehearsal. Stranger still as I began to problem solve where the clicks were coming from by muting and Pfl'ing various channels the clicks significantly sped up. (coincidence?)
Swapped Xlr cable resolved issue.
Weird ?
Any explanation would be marvelous.
The more comprehensive the better.
Cheers
Eddy

Edited by Eddy Currents (17/11/12 08:54 PM)


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Exalted Wombat



Joined: 06/02/10
Posts: 5722
Re: Weird Metronomic clicks from dodgy Xlr Cable ? new [Re: Eddy Currents]
      #1019071 - 17/11/12 09:08 PM
Any mobile phones lying around?


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Eddy Currents



Joined: 20/11/09
Posts: 68
Re: Weird Metronomic clicks from dodgy Xlr Cable ? new [Re: Exalted Wombat]
      #1019081 - 17/11/12 10:34 PM
Yes indeed, all through the day.
Funny thing is the Di was a Radial Pro d8 with 8 outputs functioning but only 1 had this weird clicks/ticks superimposed on the original audio signal.
And throughout the day many calls,texts and mobile internet connections were made without any audible evidence on any other line including guitars and bass.
The clicks were heard on all monitors and were clearly coming from this one Di output and were removed when I swapped the cable.
The level of that output increased subsequently (quite possibly two fold) which makes me suspect the cable or the connection wasn't good.
Could one speculate that the balanced line became unbalanced through a poor intermittent connection coincidentally at or around the same time a mobile text or internet message was received and that this signal was induced on that line ?

Edited by Eddy Currents (17/11/12 10:49 PM)


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Exalted Wombat



Joined: 06/02/10
Posts: 5722
Re: Weird Metronomic clicks from dodgy Xlr Cable ? new [Re: Eddy Currents]
      #1019181 - 18/11/12 06:28 PM
I wouldn't worry about balanced/unbalanced as such. Just a bad connection acting as the semiconductor in a rf detector circuit. Do you know what a "cat's whisker" was? :-)


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Eddy Currents



Joined: 20/11/09
Posts: 68
Re: Weird Metronomic clicks from dodgy Xlr Cable ? new [Re: Exalted Wombat]
      #1019201 - 18/11/12 08:25 PM
Thanks Exalted Wombat
Fascinating stuff for me to go away and look into as I confess my electronics know how is pretty limited.
The Cats Whisker ... Wonderful.
I have seen inside the crystal ball and it shouts.... Rectify my lack of electronic knowledge


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Martin WalkerModerator
Watcher Of The Skies


Joined: 28/02/01
Posts: 17489
Loc: Cornwall, UK
Re: Weird Metronomic clicks from dodgy Xlr Cable ? new [Re: Eddy Currents]
      #1019331 - 19/11/12 06:46 PM
For the uninitiated:

http://en.wikipedia.org/wiki/Cat%27s-whisker_detector



I used one myself many, many, many years ago


Martin

--------------------
YewTreeMagic


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Magic Matt



Joined: 17/09/10
Posts: 141
Re: Weird Metronomic clicks from dodgy Xlr Cable ? new [Re: Eddy Currents]
      #1019341 - 19/11/12 08:06 PM
If you were using Phantom Power, it's possible that you had power jumping across the loose connection too - that would cause a click sound.


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Hugh RobjohnsAdministrator
SOS Technical Editor


Joined: 25/07/03
Posts: 21736
Loc: Worcestershire
Re: Weird Metronomic clicks from dodgy Xlr Cable ? [Re: Eddy Currents]
      #1019419 - 20/11/12 12:09 PM
Duff cable with intermittant contact on one side.

hugh

--------------------
Technical Editor, Sound On Sound


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SafeandSound Masteri...



Joined: 23/03/08
Posts: 1047
Loc: London UK
Re: Weird Metronomic clicks from dodgy Xlr Cable ? new [Re: Martin Walker]
      #1021760 - 01/12/12 01:30 PM
Quote Martin Walker:

For the uninitiated:

http://en.wikipedia.org/wiki/Cat%27s-whisker_detector



I used one myself many, many, many years ago


Martin




I find this fascinating thanks for sharing.



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Folderol



Joined: 15/11/08
Posts: 3619
Loc: Rochester, UK
Re: Weird Metronomic clicks from dodgy Xlr Cable ? new [Re: Eddy Currents]
      #1021770 - 01/12/12 04:11 PM
Fascinating indeed, but an extreme trial of patience. Just when you've found a good spot on the crystal, someone (a seriously annoying non-geek brother) slams a door and you have to start again

--------------------
It wasn't me!
(Well, actually, it probably was)


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Martin WalkerModerator
Watcher Of The Skies


Joined: 28/02/01
Posts: 17489
Loc: Cornwall, UK
Re: Weird Metronomic clicks from dodgy Xlr Cable ? new [Re: Folderol]
      #1022171 - 03/12/12 11:17 PM
There speaks a voice of experience!


Martin

--------------------
YewTreeMagic


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