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-   -   Hum from VCR/Cable TV (http://www.diyaudio.com/forums/everything-else/1016-hum-vcr-cable-tv.html)

cm961 30th October 2001 12:53 AM

Hello All,

Basically I have my setup as this: The cable tv coax runs into my vcr, which runs into my amp via RCA cables. The problem is this: I get a very loud hum! Its terrible. Anyways, this only occurs when the cable TV is plugged into the vcr. If I disconnect TV, the VCR outputs no hum at all. I was wondering if I should short the cable tv earth or ground to the case of my amp, or if this isn't a good idea. Any help greatly appreciated.

Pete

30th October 2001 07:42 AM

Try this web site..
 
Go to:
http://www.smr-home-theatre.org/Ground-Loops/

Read the whole article.
It gives a good explaination of what causes hum. Look farther down and you'll see Cable TV recommendations etc.

johan 30th October 2001 11:56 AM

There are small small isolation transformers available mounted on TV coax cable. Just to plug in between your VCR and incoming TV-cable. Works fine, I've got one myself. Buy from your nearest electronics supplier. Costed about 7 euro.

cm961 2nd December 2001 03:48 AM

Just wanted to say thanks a lot for the replies. The information you've provided has been extremely useful... DIYAUDIO rocks!

Pete


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