The FAA still uses 13.6 volt AM around the world, even the Western air
defense com is same.
The Huge power UPS legacy sytems are part of the same old standard that
won't die.
leroy ab7ce
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!
73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
