On 3/25/2011 6:08 AM, Larry Libsch wrote:
> I must be misunderstanding something . How do I attach my
> coax shield to the outside common point and also attach it to my radio
> inside the shack?
Since I wrote the grounding chapter for Steve's book, I'll attempt to
clarify.
One ancient and accepted method of accomplishing this is often called a
"ground window," where coax cables go through lightning arrestors
(Polyphaser, ICE, etc.) that are bonded to a conductive plate (usually
copper) where they enter the building, and that plate is bonded to the
ground system. The coax from the antenna has a PL259 that screws to the
arrestor on the outside of the wall and a coax jumper with PL259s on
both ends goes between the arrestor and the radio.
Several brands of arrestors are sold in "feed-through" form, so that the
plate can be installed in a wall (or an actual window). There's nothing
magic about the feedthrough arrangement, it's just a mechanically neat
way to do it.
The MOST critical part of all of this is the bonding together of ALL
grounds associated with your home and shack -- power service entrance,
shack, CATV, telco, other lightning arrestors, building structure, all
ground rods, etc.
73, Jim Brown K9YC
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