[Amps] The Pin One Problem

[Carl]

It is obvious that you have drifted off the subject which related to the 
Station Pro which Jim thouroughly explained the ground loop issue.

Carl
KM1H


----- Original Message ----- 
From: "Joe Subich, W4TV" <lists at subich.com>
To: <amps at contesting.com>
Sent: Friday, June 07, 2013 11:12 AM
Subject: Re: [Amps] The Pin One Problem


>
> The problem is that it is not a "Ground loop" - there is no issue
> with multiple grounding if the inputs to the device are designed
> properly.  It occurs only when the signal return is not correctly
> connected to the shielded enclosure or bypassed - that also impacts
> things like VHF/UHF stability, etc.
>
> If you continue to call it a "ground loop" it is obvious that you
> do not understand the nature of the problem.  "Pin 1" problem is
> as good a term as any since the mechanism for this issue in audio
> was first identified in professional equipment using XLR connectors
> and the understanding extended to audio equipment with other
> connectors (including consumer/prosumer equipment with RCA I/O).
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 6/7/2013 10:58 AM, Carl wrote:
>> That would be too easy since ground loops go almost back to prehistory
>> when many discovered the same thing independently at almos the same time.
>>
>> OTOH, before the Brown Theorem it was always called ground loops,
>> especially in the pro audio industry.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message ----- From: "Alex Eban" <alexeban at gmail.com>
>> To: "'Ian White'" <gm3sek at ifwtech.co.uk>; <amps at contesting.com>
>> Sent: Friday, June 07, 2013 5:11 AM
>> Subject: Re: [Amps] The Pin One Problem
>>
>>
>>> What about plain old ground loops, numerology set aside?
>>> Alex 4Z5KS
>>>
>>> -----Original Message-----
>>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Ian White
>>> Sent: Friday, June 07, 2013 9:52 AM
>>> To: amps at contesting.com
>>> Subject: Re: [Amps] The Pin One Problem
>>>
>>> K9YC wrote:
>>>
>>>> When you invent, create, or discover something, you get to name it.
>>>
>>> Would that would be "Brown's Law"?  I'm sorry, Jim, but it just ain't 
>>> so.
>>>
>>> We all understand your personal respect for Neil Muncie, but there are
>>> other
>>> overriding priorities such as respect for truth and accuracy.
>>>
>>> It is only justifiable to call this "the Pin 1 problem" where that name
>>> accurately applies: specifically to Pin 1 of an XLR connector in the pro
>>> audio industry. But this problem extends far beyond the area where it 
>>> was
>>> originally identified by Neil Muncie. It is no disrespect to insist
>>> that the
>>> more generic problem needs a better name.
>>>
>>> Calling it the "Pin 1" problem in situations where it simply isn't pin 
>>> 1,
>>> and even where there isn't a connector at all, is a deliberate falsehood
>>> which misdirects and confuses people. It can only be understood by
>>> someone
>>> who is already initiated into the secret. At so many different levels,
>>> that
>>> is simply A Wrong Thing To Do.
>>>
>>> We badly need a short GENERIC name that accurately indicates the
>>> nature of
>>> the problem. That won't be easy to find, but it is something we can
>>> work on.
>>> Calling it the "Pin 1 problem" simply isn't good enough.
>>>
>>>
>>> 73 from Ian GM3SEK
>>>
>>>
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>>
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