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Serious hum problem. Help

Long time no post...

I just moved, and hooked up my system to my housemate's television. The TV gets its cable signal directly from outside- ie through an RF cable, no cable box. Whenever I plug the RF cable into the TV, the hum is awful. Changing the input on the amp or switching cables out makes no difference. I bought a new, shielding RF cable, but it didn't help at all.

Any ideas?

Thanks!
lousyreeds1

Showing 3 responses by nsgarch

nsgarch's avatar
nsgarch
2,524 posts
 
Bd -- that's the cheapest one I've seen so far -- good show!!

BTW - no matter what isolkator you use, make sure to ground the antenna or cable company side of the isolator to a good ground.
nsgarch's avatar
nsgarch
2,524 posts
 
Bd -- forgive me, I failed to mention the cheap fix (i.e. any kind of 75 ohm isolation transformer, homemade or commercial) doesn't pass digital cable signals.

I knew that, just forgot to say so. I don't know how the new isolator units work or if they can even be duplicated by DIY.
nsgarch's avatar
nsgarch
2,524 posts
 
Fickle75, I understand from some other members' posts that if you have HD cable, that most of the cable ground isolators won't pass the HD signal ;--(( Bummer!

As for the "coaxial "in" and "out" between the wall and the cable box" it depends on the particular power conditioner unit. In most of them, the "coaxial in and out" just runs the cable signal thru a filter, but it doesn't really isolate the ground, so hum is still created due to the ground loop thru the cable system.
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