[GreenKeys] Loop supplies. Again.

[Paul Heller]

We are fortunate to have folks like Jack, Gil and Eric who design circuits and boards for us.

Paul
W2TTY

> On Jul 2, 2016, at 10:04 AM, Jeffrey D Angus <jdangus at att.net> wrote:
> 
>> On 7/2/2016 4:28 AM, couryhouse via GreenKeys wrote:
>> Well one showed up recently here that was partially populated
> That was Jack, K2TTY.
> I'm the one that got it.
> 
> It was while reading the technical document for it that I spotted Gil's
> comments about loop supplies and the math behind them.
> 
> This isn't "rocket science." It's not even in the same category as Barbie's
> infamous "math is hard!" comment.
> 
> It's simple electrical theory. di/dt.
> "They" i.e. the various manufacturers and infrastructure engineers, would
> not have gone through the expense of 130 volt loop supplies at 62.5 mA
> if there was a cheaper alternative.
> 
> 
> 
> 
> -- 
> Jeff-1.0
> wa6fwi
> http://www.foxsmercantile.com
> 
> <loop supply.bmp>
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