50V AC coming from RF connector

[Art]

Agreed!! Nominal load to assuree appropiate potential measurements.

 

[ian field]

If the coax outer conductor were connected to ground at some point, then
the
voltage would go away and maybe the cable company would be happier.

Chris

If the set has a fully isolated SMPS it would be easier and neater to fit a
3-core mains lead and earth the chassis plane on the SMPS secondary side.
The cable installer would probably walk away from a set with a random
looking earth wire hanging from the co-ax socket.

 

[Chris Jones]

They're not broken, the AC voltage is due to the mains filter as I
explained - the more appliances you connect together (VCRs set top boxes
DVDs etc) the more current you can draw. If the cable company is refusing
to connect their box to TVs in this situation its hard to see how they
stay in business!

If the coax outer conductor were connected to ground at some point, then the
voltage would go away and maybe the cable company would be happier.

Chris

 

[Chris Jones]

If the set has a fully isolated SMPS it would be easier and neater to fit
a 3-core mains lead and earth the chassis plane on the SMPS secondary
side. The cable installer would probably walk away from a set with a
random looking earth wire hanging from the co-ax socket.

I got the impression that it was a cable system throughout the house with
splitters etc. and so nobody would go looking in (for example) a wall
cavity for an earth connection. Say for example that there was a splitter
with a metal casing and it just happened to be bolted to a piece of metal
that just happened to be earthed.

Chris

 

[ian field]

I got the impression that it was a cable system throughout the house with
splitters etc. and so nobody would go looking in (for example) a wall
cavity for an earth connection. Say for example that there was a splitter
with a metal casing and it just happened to be bolted to a piece of metal
that just happened to be earthed.

Chris

That would certainly be better than opening and modifying equipment.

 

[Andy Cuffe]

If the coax outer conductor were connected to ground at some point, then the
voltage would go away and maybe the cable company would be happier.

Chris

The cable system should be grounded where it enters the house. It
sounds like this ground is missing, or there's an open shield in the
coax.
Andy Cuffe

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