[Elecraft] Interference from Computers-Routers

[Doug Faunt N6TQS +1-510-655-8604]

Hi Tom,
Each ground wire has different losses, and picks up different noise, so
in fact, while they are the same on a gross level, on a fine level,
they are different.  The closer together they're tied, the more
they'll be the same.  If the intent is to minimize differences, get
them very close together.  If the intent is to isolate noise from the
other, the further away the interconnection point is, the better.

We used to install isolated ground systems for HP computers back in
the old days, since they were very sensitive to noise coming in the
power line.


73, doug

   Date: Thu, 11 Aug 2005 08:01:00 -0400
   From: "tom.w3qs" <tom.w3qs at verizon.net>
   Thread-index: AcWeDCu0x19GI2pERq+NLxNnUJYg5QAXmtUw

   Hi Stuart, 

   I have heard this so many times I think it has become 'general knowledge',
   but I don't get it.  Say you have two power strips plugged into the same
   wall outlet.  Surely the ground leads of both are then physically connected
   inside that wall outlet.  Aren't the ground leads of both then physically
   connected?

   For that matter, all grounding leads are ultimately connected to the same
   physical terminal on the house's power panel.  Again, I know there is
   'conventional wisdom' that talks of 'two' 120 loops in a 240 house, but
   still the ground leads are all connected - at least they are at my house.

   What am I missing?  

   Tom 

   -----Original Message-----
   From: elecraft-bounces at mailman.qth.net
   [mailto:elecraft-bounces at mailman.qth.net] On 

   Part of good grounding, is to run a computer used with a radio from the same

   power strip.   IF the computer is NOT used with radio, have it separated or 
   on different power circuit.

   Stuart
   K5KVH 




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