[Antennas] single point ground question

Mon May 10 21:38:23 EDT 2010

de WB2CPN
"Single Point" don't mean stuff everything on to one screw.
Your big piece of copper is a single point if you use it that
way. Single point means that all equipment, including that
which plugs into the AC outlets on the wall, has ONE path
to ground, and that path is the copper plate. Often the large
facilities will have a ground system that looks like a Christmas
Tree. The idea is to avoid "Ground Loops". Your problem is
that your equipment that plugs into the AC wall plugs are already
getting DC connectivity to ground. So you'll have ground loops.
All you have to do is connect everything directly to the piece of
copper, and to nothing else. Good Luck.
A serious consideration is what the copper plate is tied to outside
the house. There's Rules on tying power grounds, neutral grounds,
signal grounds, etc, together. My thoughts is your problem is
outside the house, not inside. I hope you get some more opinions
on this.
73 Clete The Old Phone Company Man
FireBrick wrote:
>Is this a single point ground?
>Or does this arrangement not matter.
>>I was able to scarf a 3" wide strip of pretty thick copper from a 
>roofer/gutter guy.
>About 3' long, pretty thick.
>>I drilled a bunch of holes, and with brass screws, washers and wingnuts 
>placed about 10" apart.
>I then mounted this on the wall behind the op desk and all the 
>rig/tuner/rotor/amp/etc. etc stuff is attached to one of those brass screws.
>One screw at the end, goes through the wall to the ground rod.
>My tower is right there also and it also goes to this ground rod, as does 
>the electric meter/telephone/cable drops.
>All connected together.
>>My question is, does the fact that some of the inside equipment is attached 
>to different brass screws on that strip of copper change the 'singlepoint' 
>concept?
>I would have needed a 8" bolt to get all the coax braid connected to the 
>same screw. and that would have also made the copper braid even longer than 
>needed.
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