The only reason for making "ground" negative was to prevent ionic
transfer of the copper.
Cortland, KA5S
Five years in R&D at DSC/Alcatel USA in Petaluma
On 11/5/2019 18:56 PM,
[hidden email] wrote:
> On Nov 5, 2019, at 12:19 PM, Phil Kane<
[hidden email]> wrote:
>
> ?On 11/4/2019 1:24 PM, Rick Bates (WA6NHC) wrote:
>
>> Perhaps since that is the standard voltage for cars, trucks, RVs and other vehicles.
> Commercial communication base-station equipment has been standardized at
> -48 volts(*) for quite a while and actually needs to use a voltage
> converter for the odd-ball +12 V or 120V AC equipment that has to be run.
>
> (*) -48 volts has been the telephone industry standard since Ma Bell was
> a teen-ager!
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