On 2018-04-15 10:38 PM, hawley, charles j jr wrote:
I disconnected the black wire. When it was connected, much of the
current that would have passed thru the negative power wire from the
power supply to the rig was shunted thru the green power cord wire,
the ground buss bar, and other ground connections.
More importantly, if the "station ground" - the ground from the antenna
entry panel - is not bonded to the power entry ground, a lightning event
can be carried from the chassis of the power supply back through the
electrical system safety ground to the power entry *or vice versa*
depending on the location of the "strike".
This greatly increases the chances for damages to station equipment and
all other electronic equipment in the household in event of a lightning
event.
73,
... Joe, W4TV
On 2018-04-15 10:38 PM, hawley, charles j jr wrote:
This thread prompted me to check out my Astron vs35m. It had a small black wire
from -V connected to the bottom of the chassis. Perhaps it could be called a
case or cabinet...more importantly, it’s what the green wire from the line cord
is connected to. I disconnected the black wire. When it was connected, much of
the current that would have passed thru the negative power wire from the power
supply to the rig was shunted thru the green power cord wire, the ground buss
bar, and other ground connections.
Chuck Jack
KE9UW
Sent from my iPhone, cjack
On Apr 15, 2018, at 8:58 PM, Edward McCann <ag6...@gmail.com> wrote:
Yes.
And I read he made no distinction between “case” and “chassis”, like the other
respondents.
Or did you catch something I missed?
Much obliged for your prompt response.
73,
AG6CX
Sent from my iPhone
On Apr 15, 2018, at 6:27 PM, <j...@kk9a.com> <j...@kk9a.com> wrote:
Did you read W4TV's post on this subject?
http://mailman.qth.net/pipermail/elecraft/2018-April/255072.html
Edward McCann ag6cx1 wrote:
"But there is also a small black wire that bonds the V- terminal to the
case. Should the paint around that screw also be removed???Does that
negative rail need to be bonded to the chassis??"
I'm trying to figure out the difference between the "case" and the
"chassis".
Can you help?
Jim Brown's answer is also ambiguous to me.
He says, yes scrape and attach the V- rail to deal with your black wire if
you want to bond V-, but then says don't because the negative rail should
not be bonded to the chassis.
I quote below:
"But there is also a small black wire that bonds the V- terminal to the
case. Should the paint around that screw also be removed?
Yes, IF you want to bond V-.
?Does that negative rail need to be bonded to the chassis?
No, and in general, it should NOT be bonded."
I also offer I might be out of touch with the subtleties of the concept, and
may be interpreting the comments incorrectly.
In any event, some clarification would be appreciated
What did you finally do? And did it work?
Thanks,
Ed McCann
AG6CX
Sent from my iPhone
On Apr 10, 2018, at 11:34 PM, elecraft-request at mailman.qth.net wrote:
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