18 Jan
1998
18 Jan
'98
1:11 p.m.
William Donzelli wrote:
Some big old IBM systems want to have 400 Hz power. It
is used so the
power supplies can be made smaller, especially in the filtering circuits.
This is probably more of a problem that needing 3-phase (a double whammy
if 400 Hz 3-phase power is needed!), because 400 Hz supplies are
EXPENSIVE, often taking the shape of big motor-generators.
So go to your nearest airport and steal an APU. 400hz 3-phase is
standard aircraft electrics (because motors and such can be made
smaller). It's what I dealt with in the USAF -- didn't know it
was popular on the ground once away from the maintenance shops
around the flightline. (Oh, that APU will burn kerosene very
happily -- in fact, if you try gasoline, your neighbors will
object loudly when it blows up and burns down the neighborhood.
--
Ward Griffiths
Dylan: How many years must some people exist,
before they're allowed to be free?
WDG3rd: If they "must" exist until they're "allowed",
they'll never be free.