[time-nuts] Where does 28V come from?

Robert Darlington rdarlington at gmail.com
Tue Jul 21 14:34:49 UTC 2009


Corrosion protection, similar to why the old MG cars ran on a positive
ground.

On Tue, Jul 21, 2009 at 8:25 AM, <n3izn at aol.com> wrote:

> Most wireless sites will be 28 volts also. Some are switching to the telco
> standard of -48 which when measured is actually around -56 volts. One reason
> for going to a higher voltage is, you can use smaller conductors to get same
> amount of power out.
>
> Not to steal the thread, but any one know why the telephone company choose
> to use a negative voltage? Where as the positive is referenced to ground?
> When I was a kid I was told it was because they discovered that the battery
> terminal would corrode if it was done that way?
>
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