[Elecraft] Issue 12 re Astron Power Supply

[Joe Subich, W4TV]

On 2018-04-16 9:28 AM, George Danner wrote:
 > Re-Connect it!

DON'T CONNECT THAT WIRE BETWEEN V- AND CHASSIS CASE!

Unless you have a substantial *EXTERNAL GROUND CONNECTION*
between your station ground and the electrical system ground
rod, that connection between V- and chassis will bridge the
power system "safety" ground and the station grounding and
put your delicate and expensive equipment between two "grounds"
that can separate by many hundreds of volts in a lightning
event (or equipment failure).

 > We even used ring grounds around studio & transmitter building with
 > ground rods every 10' all cad-welded.

That is proper grounding and bonds all entry points together *OUTSIDE*
the building to prevent grounds from separating.  It creates a common
"island" for everything inside the building.  However, for the majority
of amateur stations which fail to properly bond the shields of all of
the coaxial cables entering the shack to the electrical system ground
*at the meter*, there is no "island" ... more like an isthmus across
the equipment.

73,

    ... Joe, W4TV


On 2018-04-16 9:28 AM, George Danner wrote:
> Re-Connect it!
> 
>> From a broadcaster (AM,FM & TV) was in South Florida (lightning 
>> capital of 
> North America).
> 
> The more massive the common (ground, bonding, whatever term you use) for 
> the connection between equipment and the power company ground connection 
> the better.
> We even used ring grounds around studio & transmitter building with 
> ground rods every 10' all cad-welded. This is probably over kill for a 
> ham station; but think as massive as you can.
> Towers at 500' or above had 2 ring grounds and lots of ground rods.
> 
> The common for equipment interconnection is for safety first and the 
> reduction of voltage drops on the common lines that can transfer from 
> one piece of equipment to another (us old timers use the term ground 
> loop - not PC any more).
> 
> 73 George AI4VZ
> 
> -----Original Message----- From: Charlie T
> 
> "This greatly increases the chances for damages to station equipment and 
> all other electronic equipment in the household in event of a lightning 
> event."
> 
> What is, disconnecting the wire or leaving it in place?
> Your comment can be taken both ways.
> 
> 73, Charlie k3ICH
> 
> 
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