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Originally Posted by hedgie
Well there you go ! Something is obviously not right I have an optical connection to my AV Amp and a composite out using a SCART Splitter on the STB. I have no noise or pickup at all.
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Yes, same configuration for me: Optical audio connection and Scart to Composite(RCA) from STB to the AV Receiver, but lots of noise. The receiver features a grounding, like yours. Now I even connected the analog audio RCA connections from the Scart too (needed for 2nd headphone pair, since it does not transform digital input to its 2nd analog audio out plugs), and still no noise!
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I am intrigued by this, certainly every device I have opened up in recent years with a metal case has had an earth lead to the case. It may not require it, but what's the harm ? It may even help with EMC Shielding. Even my PC case has an earth point on the chassis, then again that has three pin IEC "Kettle Lead" so no surprise really !!
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Yes, thanks for your input: I thought exactly like you did, when I took a look at the Scientific Atlanta 4200DVB and noticed that it only has a two-wire connection! Humming is usually caused by a bad ground, but to my surprise there was no ground at all!
This then naturally led to my idea of "adding" a grounding, because what could be the harm if almost all other devices are grounded too? Of course, I first checked what would happen by measuring the difference in potential, rather than blindly adding a wire!
However, since I thus connected the "cable"-mass to my household grounding, I wonder whether this affects the "cable" part outside my house. Could it mess up my neighbour's TV reception? I have no idea about antenna/cable stuff and transmission of TV & Internet through a single coaxial cable - which is why I am asking for help here!