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wallace123456
Joined: 14 Aug 2006
Posts: 2236
Location: Northwest VA area
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| Posted: Fri Apr 15, 2011 3:50 am Post subject: Anybody use Ferrite Interference Choke on power cables? |
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I got some power cables that had ferrite interference chokes on them. The cables are shielded, so I guess the reason for the chokes that someone put on them.
Your thoughts are welcome as I wonder if they make any difference.
wallace
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Bucketfoot
Joined: 17 Mar 2006
Posts: 698
Location: Centennial, CO
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| Posted: Fri Apr 15, 2011 8:14 pm Post subject: |
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I have used them in the past for EMI reduction in the design of satellite receivers. They can be somewhat effective on the outside of a cable, but are much more effective when you strip the cable and can loop the loose wires through it a couple of times.
Generally speaking they are a crutch used to compensate for someone who did not properly account for EMI in the original design.
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wallace123456
Joined: 14 Aug 2006
Posts: 2236
Location: Northwest VA area
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| Posted: Fri Apr 15, 2011 10:26 pm Post subject: |
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| Bucketfoot wrote: | I have used them in the past for EMI reduction in the design of satellite receivers. They can be somewhat effective on the outside of a cable, but are much more effective when you strip the cable and can loop the loose wires through it a couple of times.
Generally speaking they are a crutch used to compensate for someone who did not properly account for EMI in the original design. |
Yep, that's what I am seeing on web sites; mainly marketed and used for coax cable stuff.
Anybody have any idea how the effectiveness of them could be measured?
wallace
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Bucketfoot
Joined: 17 Mar 2006
Posts: 698
Location: Centennial, CO
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| Posted: Fri Apr 15, 2011 11:05 pm Post subject: |
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| wallace123456 wrote: |
Anybody have any idea how the effectiveness of them could be measured?
wallace |
Short of using a spectrum analyzer along with a LISN (for conducted emissions) or the appropriate antenna (for radiated emission) to measure the actual application, not really.
But then who needs measurements, just put it on and use the audiophile method of claiming there is now an openness or some other wonderful change that you never heard before 
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Bucketfoot
Joined: 17 Mar 2006
Posts: 698
Location: Centennial, CO
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| Posted: Fri Apr 15, 2011 11:06 pm Post subject: |
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| wallace123456 wrote: |
Anybody have any idea how the effectiveness of them could be measured?
wallace |
Short of using a spectrum analyzer along with a LISN (for conducted emissions) or the appropriate antenna (for radiated emission) to measure the actual application, not really.
But then who needs measurements, just put it on and use the audiophile method of claiming there is now an openness or some other wonderful change that you never heard before
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri Apr 15, 2011 11:08 pm Post subject: |
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| Bucketfoot wrote: | | wallace123456 wrote: |
Anybody have any idea how the effectiveness of them could be measured?
wallace |
Short of using a spectrum analyzer along with a LISN (for conducted emissions) or the appropriate antenna (for radiated emission) to measure the actual application, not really.
But then who needs measurements, just put it on and use the audiophile method of claiming there is now an openness or some other wonderful change that you never heard before |
| Bucketfoot wrote: | | wallace123456 wrote: |
Anybody have any idea how the effectiveness of them could be measured?
wallace |
Short of using a spectrum analyzer along with a LISN (for conducted emissions) or the appropriate antenna (for radiated emission) to measure the actual application, not really.
But then who needs measurements, just put it on and use the audiophile method of claiming there is now an openness or some other wonderful change that you never heard before |
That bears repeating 
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Bucketfoot
Joined: 17 Mar 2006
Posts: 698
Location: Centennial, CO
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| Posted: Fri Apr 15, 2011 11:12 pm Post subject: |
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I'm way down the list and have to boost my post count 
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri Apr 15, 2011 11:13 pm Post subject: |
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| Bucketfoot wrote: | | I'm way down the list and have to boost my post count |
Say no MORE!
wink wink nudge nudge knowhatimean?
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wallace123456
Joined: 14 Aug 2006
Posts: 2236
Location: Northwest VA area
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| Posted: Fri Jun 17, 2011 12:27 am Post subject: |
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Funny; as I was doing some fan mods on this G90, it seems that Sony decided to use the chokes as well.
wallace
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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cinema mad
Joined: 25 Nov 2009
Posts: 219
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| Posted: Sat Jun 18, 2011 2:40 pm Post subject: |
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I have used them on unshielded power cables in the past & long run HDMI cables if they come in the pack..
Jase..
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