About ground loop noise isolator

This is not only bad for the equipment you want it to hook up too, but it can be bad for the human. Use a voltmeter on AC and measure the jack in question against a known good ground and see how many voltage u taking. Even relatively low voltage can be bad if it carries lots of current.
 

mrsam1999

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Apr 2, 2009
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i dont know how to use a voltmeter..but i took a tester and touched it to the 3.5 mm jack..the tester led lights up dimly..also if i touch the 3.5 mm jack and the home theater vol is max..the speakers sound buzzing sound..if the vol is put to less than 50%..the buzz also sounds low and if the vol is 10%..the buzz is non existant.
 
If you have a ground loop you want to find out where it is.
Disconnect the sources one at a time. When the noise goes away that component has a ground loop. Make sure to turn or or mute the receiver when you pull cables.
If you still hear it when all the inputs are disconnected then the noise is coming from inside the HTS.
If the cable box is the culprit then disconnect the input to the box and listen again. If this works you can use a coax ground loop isolator on the that RG6 cable. You can try using a 3-2 ground lifter on AC cords. While not strictly speaking the best permanent solution is doesn't often cause any problems. There are isolators for analog audio and video but I don't not for digital. You have to work at the AC end for those.
http://web.mit.edu/~jhawk/tmp/p/EST016_Ground_Loops_handout.pdf
https://www.amazon.com/Isolation-Transformer-Ground-Loop-Isolator/dp/B00B2HFE2O/ref=sr_1_fkmr0_4?s=electronics&ie=UTF8&qid=1534177777&sr=1-4-fkmr0&keywords=antenna+ground+isolator
 
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