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Direct TV causing hum in audio system

Hello,

I'm experiencing a humming problem when I integrate my direct tv into my audio system. When I disconnect the satelite cable, the hum goes away. Am I experiencing a ground loop? Is the solution to ground the satelite dish? (I had the dish installed free as part of a promotion.) I heard cable tv can cause this problem and wondered if satelite tv is any different?
ethannnn

Showing 1 response by dave_l

dave_l
15 posts
 
I believe the satellite box sends a DC signal back to the dish to alter the horizontal/vertical polarity of the receive horn. If you put something in the line, such as back to back 75/300 Ohm transformers, you block the DC signal going back to the dish so the dish never changes its polarity. I presume that is why Treyhoss lost half his channels with the Mondial thing. As mentioned in an earlier post, make sure the dish is grounded to the main electrical ground.

Best regards,
Dave
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