At 10:59 PM 4/18/03 -0400, Van Fair wrote:
>----- Original Message -----
>From: Van Fair
>To: towertalk-request@contesting.com
>Sent: Friday, April 18, 2003 11:16 AM
>Subject: ground
>
>
>The power company in my area offers a whole house surge protection system
>which mounts behind the meter for $5 per month. I recently had it
>installed in my home. They installed a new meter ground rod which changed
>my ground from 150 ohms to 65 ohms. In talking to the installer I told him
>about my ground at the tower which measured 120 ohms and the ground at my
>rig which measured 195 ohms. Since I have 3 ground systems There is
>potential for a problem.
>
>The tower grounds and the rig grounds are connected via the 5 coax shields
>which are all grounded to the rod at the base of the tower. . All the rig
>and tuner grounds go to one point on the operating table and from there 10
>feet to another 10 ft ground rod. The rigs are also grounded through
>the AC cords to the house ground. Question? Should I tie my central
>ground point on the operating table to the house ground via the ground on
>the 240 volt plug. Do I have a potential problem. Suggestions.
>
>By the way the power company used a chemical welding device called a
>oneshot GR1161G to weld the ground wire to the ground rod. Its a small
>ceramic tube which fits over the rod and burns gunpowder and a starter to
>develop heat to make the weld
i was thinking cadweld was the name for that system
look at http://www.contractconnections.co.nz/cadweld.shtml
there is lots of makers making about the same systum
>. A neat little device. He also used a 120 volt device like a big drill
>which drove the rod in the ground in 30 seconds. NEAT.
i have used a hammer drill the kind that will use 6 in core drill bits
the $200-400+ power drill
>_______________________________________________
ken
kb9yku
|