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Re: [Amps] IM distortion and such

Subject: Re: [Amps] IM distortion and such
From: "Will Matney" <>
Date: Mon, 26 Jun 2006 21:28:58 -0400
List-post: <>

I totally agree with everything you said. I'm not trying to down the AL-80, 
it's just saying that in the manual can set a company up for liability. That 
was the point I was trying to get across. If Ameritron has a letter from Eimac 
saying it's ok, then they are relieved of the liability.

By the way, the factor you mention, I always called the fudge factor or safety 
factor. Same thing all around : )



*********** REPLY SEPARATOR  ***********

On 6/26/06 at 9:17 PM Bill Coleman wrote:

>On Jun 26, 2006, at 10:51 AM, Will Matney wrote:
>> Now what if a designer said they'd carry a 40 amp load at 10  
>> amperes a piece? How long would they last at this output? Would  
>> Motorola warranty them at this? What kind of reputation would the  
>> manufacturer get over their power supplies blowing pass transistors  
>> under full load? Are they willing to replace the product? Are they  
>> ready for a law suit from a disgruntled customer? The design falls  
>> back on the engineer, his license, and liability at worse case.  
>> Where I worked in mining machinery, it occurred often.
>In mechanical engineering, they usually refer to this as a "design  
>rule". For example, light aircraft are typically designed to  
>withstand 3.8 positive Gs (in the Normal category). But, you wouldn't  
>build a structure that can just withstand 3.8 positive Gs and then  
>fail. No, you'd design a structure that could withstand 1.5 to 2.5  
>times MORE, depending on the materials and construction techniques.
>Aircraft are a good example, because that extra strength comes at a  
>price: weight. Excess weight costs aircraft dearly in nearly every  
>performance category. The design rule is purposely kept low.
>The design rule allows you to compensate for factors that are beyond  
>your control, such as differences in assembly, deterioration of  
>materials, improper use, improper installation.
>Design rules vary depending on the type of design. Man-carrying  
>equipment, for example, requires, by law, design rules of 10 or more.  
>That's why that clip for your tower belt is rated for 5000 lbs, even  
>though it isn't even likely to see 500 lbs.
>The AL-80A and AL-80B have been around long enough to establish a  
>positive track record. It's pretty clear, that regardless of what the  
>manual says, these units are not self-destructing because of  
>excessive plate current.
>Bill Coleman, AA4LR, PP-ASEL        Mail:
>Quote: "Not within a thousand years will man ever fly!"
>             -- Wilbur Wright, 1901
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