Richard Clark wrote in message
news
On Tue, 13 Apr 2004 16:47:37 +0200, Toni wrote:

Hi,

In this page:

http://www.jensentransformers.com/apps_wp.html

Look at this document:

http://www.jensentransformers.com/an/ts_guide.pdf

Of course they try to sell you their solutions, but the problem-
finding methodology and some solving tips are very good.

Toni

Hi Toni,

Good references. The products they would sell would be very useful as
some problems fail other resolutions (Gerhard was lucky). Myself, I
have a Mains isolation transformer for my floating battery charger
(and batteries) which powers my equipment. For me, Ground is at the
Antenna connector output (actually a threaded stub nearby) and not
both there and through the third wire. I also have isolation
transformers for the audio signal that goes off to my 'puter.

73's
Richard Clark, KB7QHC

Isolating the equipment from normal power ground and establishing a new
common ground point was a common practice in the computer industry some
years ago. The high end stuff had triple shielded iso-transformers. The
first shield was connected to the AC neutral. A sort-of ground, but probably
useful in allowing shield capacitive current to be returned to the neutral
and avoid tripping GFI protected circuits. The second shield was connected
to building power ground (the "green wire") and only needed to deal with
potentials between neutral and ground, hopefully fairly low The third shield
was the "isolated ground" common point, connected to the equipment ground,
secondary neutral, and a local "earth" ground (building steel, etc.)