[Elecraft] Issue 12 re Astron Power Supply

[Joe Subich, W4TV]

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 <ag6cx1 at 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, <john at kk9a.com> <john at 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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