On 7/7/2013 12:10 AM, Jim Wiley wrote:
These will be used to remove a ground-loop problem between my computer
and other equipment.
You do NOT need a transformer. What you DO need is simple bonding.
http://audiosystemsgroup.com/HamInterfacing.pdf
There are two simple steps.
1) Get power for all of the radio equipment, and for all equipment
connected to your radio equipment (computer, computer monitor) from the
same 120V electrical outlet.
2) Bond from chassis to chassis of all equipment that has an unbalanced
signal connection to your radio equipment (rig, computer, audio
processing, etc.) with short, fat copper. I use the braid stripped from
good transmitting coax (RG8), which is typically the equivalent of #10.
And, of course, add a short fat bond from the rig to the station ground.
That's all you need. A chassis connection to most laptops can be found
at the connector retaining screw of DB-connectors (SVGA, LPT, RS232).
There is, by the way, no such thing as a "ground loop." The REAL cause
of the problem is simple leakage current within the AC power system. See
the link above for an explanation.
73, Jim K9YC
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