Video Asylum

• Re: Device to stop ground loop hum from CATV in my HT? - mgrissom 14:55:59 02/07/03 (0)
  In Reply to: Device to stop ground loop hum from CATV in my HT? posted by audiophile15 on February 04, 2003 at 18:08:45:

  I suffered along with this problem for about a year off and on.

  I first tried the isolation trasformers from Radio Shack. They worked however I had to hook them up to different audio connections as I had my system set up to both the TV and the VCR and I felt as though there was a degredation to the sound. this might not have happened with the Jensen's which are high quality but I thought the Jensen was a bit expensive.

  I did try disconnecting the ground from the cable coming into my house and connecting it to various places however nothing I tried in this respect eliminated the hum. The cable co. offered to send someone out to ivestigate the problem, however as thay felt this was caused by the Hi Fi there would be a service charge of $35.00+ even if they couldn't solve the problem. And they addmitted that they might not be able to solve it.

  I tried the Radio Shack 75 ohm bellon connected to the 300 ohm splitter set up and it stopped the hum, however it also eliminated at least 3 of the pay channels that I regularly watched and was paying for and may have eliminated some channels that I didn't watch. (I have a digital HDTV cable converter, this may not be a problem if you don't have digital.)

  I also tried cheater plugs on some of my audio equipment. I had some sucsess with this however the audio manufacturer (Audio Research)strongly advised against this approch. They suggested that a ground break on the cable was a better solution.

  A friend of mine who use to work for the technical dept at a cable co. got me an isolation transformer called the Viewsonics ISOLATOR Model # VSIV-EU. I have no Idea where to get these however I did find Viewsonics on the Web and they are a company that supplies products to cable and satalite companies for insallation. I only had to use one of these as it hooks up from the cable wire input into the cable box and has eliminated all the hum from my system. This device also has no effect that I can tell on the incomming cable system signal.

  The Viewsonics looks like the Dayton Vidio Isolation Transformer cat # 180-075 that is mentioned in the post below however it is about twice as big.

  I'm curious as to how well the Dayton works as this was such a problem for me. I tried different things that were posted, finally found a simple solution, and don't have a source for the Isolator I found that works.
  
  

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• Re: This works well - Harlowe 10:04:48 02/06/03 (2)
  In Reply to: Device to stop ground loop hum from CATV in my HT? posted by audiophile15 on February 04, 2003 at 18:08:45:

  Make sure you copy and paste the WHOLE link

  http://www.partsexpress.com/pe/showdetl.cfm?&User_ID=11266392&St=5765&St2=43362613&St3=-72624939&DS_ID=3&Product_ID=16262&DID=7
  
  

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  • Thanks for the heads up. - Hepcat 07:22:04 02/07/03 (1)
    In Reply to: Re: This works well posted by Harlowe on February 06, 2003 at 10:04:48:

    I just ordered 3 of those isolation transformers.

    Since my cable company upgraded I have a fierce hum from the TV, and VCR connections etc.
    
    

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    • Re: Thanks for the heads up. - Sam M 07:56:55 02/07/03 (0)
      In Reply to: Thanks for the heads up. posted by Hepcat on February 07, 2003 at 07:22:04:

      You should have asked the cable company to properly ground your cable to the common house ground instead of patching the problem.

      Sam
      
      

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• Re: Device to stop ground loop hum from CATV in my HT? - Sam M 18:48:25 02/04/03 (0)
  In Reply to: Device to stop ground loop hum from CATV in my HT? posted by audiophile15 on February 04, 2003 at 18:08:45:

  The best ones are made by www.jensentransformers.com

  However, this is like using duct tape and coat hangers to "tape over" the problem. I would trace where the cable is currently being grounded and then re-ground it to the common house-ground! much cheaper solution and will have the most effect on cleaning up your system!

  Sam
  
  

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