I think I overheard at Visalia that the KPA500 draws only 1 kW from the AC power line with 500W out. It uses a high-efficiency toroidal power transformer. I doubt that a switching power supply would do any better than that.
The total weight is about 22 pounds I believe. Less than many transceivers. Al N1AL On Sun, 2010-04-18 at 17:02 -0500, Bob McGraw - K4TAX wrote: > I'll pass on linear supplies. Too heavy, too inefficient. > > 73 > Bob, K4TAX > > > > ----- Original Message ----- > From: "Doug Faunt N6TQS +1-510-655-8604" <[email protected]> > To: <[email protected]> > Cc: <[email protected]>; <[email protected]>; <[email protected]> > Sent: Sunday, April 18, 2010 4:56 PM > Subject: Re: [Elecraft] KPA500 > > > > It's not a switcher. As is common for linear power supplies (and not > > uncommon for switchers), there's an input voltage selector as part of > > the input power connector/fuse/switch combo. > > > > Since the power transformer is 15 of the 22 pounds weight, one of my > > thoughts was to ship that part (or an extra) ahead when traveling, and > > when I asked was told that currently it takes about 15 minutes to > > install, but that time might be cut. > > > > 73, doug > > > > From: "Bob McGraw - K4TAX" <[email protected]> > > Date: Sun, 18 Apr 2010 16:24:43 -0500 > > > > Any switching supply today and one that's "worth it's salt" should > > operate > > satisfactorily from 100 VAC to 250 VAC. So 120 VAC or 230VAC should > > not be > > of conern. > > > > 73 > > Bob, K4TAX > > > > > > ----- Original Message ----- > > From: "Don Wilhelm" <[email protected]> > > To: "David Ferrington, M0XDF" <[email protected]> > > Cc: <[email protected]> > > Sent: Friday, April 16, 2010 3:40 PM > > Subject: Re: [Elecraft] KPA500 > > > > > David, > > > > > > Because not all have hamshacks that are wired for 220 volts. If the > > > space was not wired specifically for hamshack use, there is likely to > > be > > > only 120 volt receptacles available. Up to 1000 watts draw (500 > > watts > > > with 50% efficiency) on a normal 120 volt 15 amp circuit is practical, > > > but attempting to run more than becomes marginal. > > > > > > 73, > > > Don W3FPR > > > > > > David Ferrington, M0XDF wrote: > > >> I'm intrigued, obviously we'd look for 220v over here, but why not > > 120v > > >> in US? > > >> 73 de M0XDF, K3 #174 > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
