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September 9th 18, 11:43 PM posted to uk.radio.amateur,rec.radio.amateur.antenna

Ralph Mowery Ralph Mowery is offline

Ralph Mowery is offline

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Earth rods, etc

In article , says...

Yet another ground to contend with is whatever may come with a cable TV
connection. (Sorry for my ignorance, I am not sure how to translate for
the other side of the Atlantic! In the US we typically have a 75 ohm
coax coming in for this purpose.) At another residence I had about 3
volts between that ground and the ground for AC power. When I connected
the coax to an FM tuner in the music system, to play an FM station that
was carried at baseband, that put 3 volts between the tuner's antenna
connection and its power connection (until I eventually put in some
isolation...) There was a lot of hum out of the system with a 300 watt
audio amp feeding the speakers!
Bob Wilson, WA9D

All ground rods and other earth grounds have to be bonded together or
you have no real ground system.

That is you can not have a ground rod on one side of the house connected
to something and another ground rod on the other side of the house
connected to other equipment unless you run a bonding wire between the
two.

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