[Elecraft] Mac Grounding

Mon Apr 11 22:40:23 EDT 2011

Forgive me if I misunderstood Don's response, but normally a computer regardless of make or model is grounded via the power supply negating any need for additional measures.  

The above statement is only applicable if the home ground has been properly facilitated.  Of course, all bets are off if this is not the case.

Apart from that, OS or computer make if grounded correctly should not pose any threat in a station should the shack's earth ground fail. 

Please correct me if I'm wrong, but what Phil has described has been the norm at 4U1UN for many years without fail; not by choice but due to wiring restrictions and location the club has endured for many years.

73,
James K2QI
Sent via BlackBerry from T-Mobile

-----Original Message-----
From: Don Wilhelm <w3fpr at embarqmail.com>
Sender: elecraft-bounces at mailman.qth.net
Date: Mon, 11 Apr 2011 22:27:12 
To: Phil Hystad<phystad at mac.com>
Reply-To: don at w3fpr.com
Cc: Rick Prather<k6limaecho at gmail.com>; elecraft<elecraft at mailman.qth.net>
Subject: Re: [Elecraft] Mac Grounding

  Phil,

May I suggest that your operating situation is not the norm.  There are 
those using Macs who do need to know how to bond the computer ground 
into their station ground system.  Please do not discourage them just 
because your operation does not need it.

Even in your case, if a surge event does occur, there can be a personnel 
danger if one part of your body is in contact with the computer, while 
another part is in contact with a properly grounded piece of radio 
equipment.  It is more than just a noise creating situation, it is a 
matter of your safety while in the radio shack.

Having two pieces of equipment at different chassis potentials is not a 
good thing.  The differential may be small and tolerable under normal 
conditions, but in the case of a surge event, that difference can be 
huge, and even life threatening.  While Jim Brown's documents 
concentrate on noise created by small differences in ground potential, 
there is another side of the story, and that is one of safety - not 
under normal conditions, but during a surge event.

73,
Don W3FPR

On 4/11/2011 10:11 PM, Phil Hystad wrote:
> I understand the technical reasons that people suggest for grounding but I do not see the need.  I have no problems.  If there are problems, they are invisible to me.  By the way, my Signalink is connected to my Mac only when I am using it.  The reason is that I usually use the Signalink from my laptop and not my iMac and most of the time I am not using the Signalink.  I think I last did PSK31 about two weeks ago and that was the first time in several months.
>
> At least 90 percent of all my contacts are CW.  I never use a computer in tandem with my radio work.  I think that is a real hassle and it does not interest me.  I do enter log information in my own home grown logging application but I do not interface the computers to the radio.  The only reason I do that is when I need to do a K3 or P3 firmware upgrade and when I do PSK31 (both of these are relatively rare events).
>
> By the way, I do love ham radio but I am in front of my laptop (usually sitting on the couch here in my room) more then I am in front of my radios.  Thus, my computers are situated for all my programming activities, not for radio work.
>
> phil
>
>
> On Apr 11, 2011, at 6:45 PM, Robert Harmon wrote:
>
>> I have two Mac laptop computers in the shack.  An aluminum encased MacBook Pro and a plastic cased MacBook.
>> Is their a way to ground these without drilling/clamping etc ?  I understand the need but I'm not very excited
>> about modifying my Macs to provide grounding.
>>
>> Bob
>> K6UJ
>>
>>
>>
>>
>> On Apr 11, 2011, at 6:37 PM, Rick Prather wrote:
>>
>>> I have the aluminum 24" and I use a screw clamp on the aluminum leg on the back.
>>>
>>> Definitely eliminated the potential difference I used to see from the Mac to the radio.
>>>
>>> As much as I love Mac's there is nothing inherently magic about them that disallows the need for proper grounding.
>>>
>>> Also, running a ground strap is not in any way going to alter the warranty.
>>>
>>> In Phil's case, even using the SignalLink (for whatever reason) does not preclude the possibility of needing the units bonded together.
>>>
>>> I wondered how long it would take K9YC to weigh in on this and I'm sure he can do a much better job of explaining the requirement.  Taking a look at his tutorial  is an excellent idea.
>>>
>>> Rick
>>> K6LE
>>>
>>> On 4/11/2011, at 5:53 , Ray Sills wrote:
>>>
>>>> Hi Rick:
>>>>
>>>> Where to you connect that ground strap?  My iMac (17" Intel) is
>>>> totally encased in plastic!
>>>>
>>>> 73 de Ray
>>>> K2ULR
>>>>
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