[Elecraft] best grounding technique
Jim Brown
jim at audiosystemsgroup.com
Sat Mar 20 14:22:56 EDT 2021
On 3/20/2021 8:57 AM, Wes wrote:
> If Rick's comment is accurate, and I have no reason to think otherwise,
> then what it states is in direct conflict with what one co-author (K9YC)
> has preached for years, that each box should connect to the next and
> there is only one connected to the ground system. He even calls it
> madness to use individual connections to a common ground bus.
Ward's text on this topic does, include my recommendations for
"daisy-chain" bonding of interconnected equipment, but also downgrades
it in favor of a star WITHIN THE STATION, and with an emphasis on
keeping bonding connections short. He includes a photo I provided of
W6GJB's neatly packaged station for his contesting trailer, showing a
copper pape bonding bus just behind the equipment, with bonding
conductors to it from each piece of gear. The emphasis is on keeping
bonding conductors very short, both to minimize power line buzz and
potential differences between equipment in a lightning event. He shows
how an Al sheet laid on top of the operating desk can serve as both a
bonding plane and minimize induction onto cables laid on it. And he has
incorporated my advice that the loop area of interconnecting cables and
bonding cables should be minimized to prevent magnetic coupling by
bundling or lacing them together.
There's also very good text on proper shield connections (the Pin One
Problem), bypassing of unshielded conductors at penetrations of
enclosures. There's material on the use of ferrite chokes to prevent RF
in the shack, how to deal with end-fed antennas with a feedpoint in the
shack, and lots of other good stuff.
Another goal, covered in the last chapter which is not yet done, is to
address second floor shacks. Outside the shack, there's very good
discussion of towers, bonding of the entire premises, ground rods,
connection methods, and so on. Everything conforms to NEC and good
engineering practice.
73, Jim K9YC
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