Topic: Any experience with snap choke core to eliminate interference

[mloewen]

Just wondering if this would work to put on microphone cables to get rid of cell phone interference.

Mark

[bryonsos]

Interested too.

[F.O.Bean]

WTF is that

[mosquito]

FOBean, I'm pretty sure they're referring to the type of ferrite cylinders that can be snapped onto cables.  The "non-snap on" varieties are commonly used on computer video cables (and sometimes on USB cables, etc.)

mloewen, have you seen this thread?  I think it'll interest you:  http://taperssection.com/index.php?topic=152259.0  In there DSatz gives this link:

Recommended reading: Go to http://www.audiosystemsgroup.com/publish.htm, scroll down to where it says "Hum, Buzz, and RF Interference" and have yourself a feast of useful information.

One of the papers there, http://www.audiosystemsgroup.com/SAC0305Ferrites.pdf , says that it can help but you have to get the right size and kind *and it also says* that doing some other things will help a lot too.  Check it out.

[twatts (pants are so over-rated...)]

Is this what we're talking about???  http://parts.digikey.com/1/parts-kws/ferrite-cable-clamp

I have one from TDK, not sure where I got it from...  I found it in the bottom of my stereo junk box...

Terry

[F.O.Bean]

FOBean, I'm pretty sure they're referring to the type of ferrite cylinders that can be snapped onto cables.  The "non-snap on" varieties are commonly used on computer video cables (and sometimes on USB cables, etc.)

mloewen, have you seen this thread?  I think it'll interest you:  http://taperssection.com/index.php?topic=152259.0  In there DSatz gives this link:

Recommended reading: Go to http://www.audiosystemsgroup.com/publish.htm, scroll down to where it says "Hum, Buzz, and RF Interference" and have yourself a feast of useful information.

One of the papers there, http://www.audiosystemsgroup.com/SAC0305Ferrites.pdf , says that it can help but you have to get the right size and kind *and it also says* that doing some other things will help a lot too.  Check it out.

Ahh, ok, thanks

[Gutbucket]

Is this what we're talking about???  http://parts.digikey.com/1/parts-kws/ferrite-cable-clamp

Yep.  Note that they are most effective if you loop the cable so it passes through the ferrite twice, but that may not be practical with mic cables and typically isn't done on computer peripheral cables.  I have no idea on their effectiveness for audio cables.

[Gutbucket]

Jon, does it matter where the ferrite bead is placed?  Wondering if it should be placed as close as possible to the recorder/premap end.. or should it work just as effectively placed anywhere on the cable?

[mattmiller]

Is this what we're talking about???  http://parts.digikey.com/1/parts-kws/ferrite-cable-clamp

This just answered one of my top 10 questions in life -- what the hell ARE those things snapped around so many of my cables.  I've always forgotten to search the web, and now I've stumbled upon the answer purely by accident.

[mloewen]

Good discussion guys . I was thinking getting 2 of the ferrite things and putting one  near each end of the cable. I guess a good way to test would to have a phone that t causes interference then snap on and test to see if it works. If any body can try this and let us know.

[twatts (pants are so over-rated...)]

I snapped one of these onto my SPDIF cable (r500 > hd-p2) and it made my recordings sound almost as good as these things did:

http://www.machinadynamica.com/machina45.htm

Terry

[DigiGal]

Here are the readily available radio shack varieties.  Has anyone tried them on mic cables to successfully eliminate cell phone noise?

http://www.radioshack.com/product/index.jsp?productId=2103222#

http://www.radioshack.com/product/index.jsp?productId=2103979

I just got hit with a couple of bursts of the cell phone interference for the first time using the stock AKG Blueline Active cables.  Never had it happen before with the same cabling, maybe I was lucky before but people were texting near me during the show and I was in the audience FOB not in a taper section this time.   Thankfully I was able to edit them out but if one of these on each cable could prevent it in the first place that would be ideal. 

[it-goes-to-eleven]

Dang.   I was hoping "snap choke core" was a new technique to eliminate interference from talkers.

[Gutbucket]

^^
heh, sort of sounds like a name of a musical sub-genre, too.

[DigiGal]

Hmm, wonder if a pair of these before the mics go in to the recorder would prevent cell phone interference.

http://www.markertek.com/Audio-Equipment/Audio-Processing/Audio-Hum-Noise-Eliminators/Sescom/SES-INLINE-EMCF.xhtml?SES-INLINE-EMCF

Sescom SES-INLINE-EMCF Inline RF Filter XLR Male to Neutrik EMC Female Grnd Lift