Yes I can concur with this. I operate some Navy transmitters (at home) and
while on the vessel they used 3 phase power supplies which were physically
smaller and produced less ripple. At home, I use a 1 phase power supply just
fine. These were 1KW output (4KW input) transmitters so not a lot of power but
benefitted from low ripple.
73 Eugene W2HX
-----Original Message-----
From: Paul Koning via cctalk <cctalk@classiccmp.org>
<snip>
But apart from circular motion (i.e., feeding motors) there is a second reason
to use three phase power: reduced ripple. Full wave rectification of n Hz
mains power gives you a 2n Hz ripple; full wave rectification of 3-phase n Hz
mains produces a 6 Hz ripple, and tha amplitude is a lot less as well. So the
filters are much smaller, which is a non-trivial matter if you need to filter
several hundred amps. That of course assumes your power supplies are actually
fed off the three phase mains, rather than being individual single phase
supplies spread over the phases. The former was certainly the case with the
CDC 6600, you can see it clearly in the schematics.
paul
