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Weird Metronomic clicks from dodgy Xlr Cable ?

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Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Eddy Currents » Sat Nov 17, 2012 8:48 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
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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Exalted Wombat » Sat Nov 17, 2012 9:08 pm

Any mobile phones lying around?
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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Eddy Currents » Sat Nov 17, 2012 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 ?
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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Exalted Wombat » Sun Nov 18, 2012 6:28 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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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Eddy Currents » Sun Nov 18, 2012 8:25 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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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Martin Walker » Mon Nov 19, 2012 6:46 pm

For the uninitiated:

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

Image

I used one myself many, many, many years ago :beamup:


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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Magic Matt » Mon Nov 19, 2012 8:06 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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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Hugh Robjohns » Tue Nov 20, 2012 12:09 pm

Duff cable with intermittant contact on one side.

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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby SafeandSound Mastering » Sat Dec 01, 2012 1:30 pm

Martin Walker wrote:For the uninitiated:

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

Image

I used one myself many, many, many years ago :beamup:


Martin


I find this fascinating thanks for sharing.

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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Folderol » Sat Dec 01, 2012 4:11 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 :frown:
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Re: Weird Metronomic clicks from dodgy Xlr Cable ?

Postby Martin Walker » Mon Dec 03, 2012 11:17 pm

There speaks a voice of experience! 8-)


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