See my earlier note as to one reason it was chosen. Elecraft learned from the K2 about being a good player in a multi-TX environment (which can just be neighbors). Also, the 60V supply is providing no current when key up, and needs to go to full output on key down- apparently this is less of a problem with a linear supply than with a switcher. And of particular significance to CW ops.
BTW, much of what I'm writing is my repeating what I was told or heard, and none of it is binding on Elecraft, and is subject to my misinterpretation, as well as changes down the line. The amp is still in prototype, and has lots of testing to endure before it's solid. I trusted them two years ago (i have K3 #22) and I trust them now. 73, doug From: "Bob McGraw - K4TAX" <[email protected]> Date: Sun, 18 Apr 2010 17:02:04 -0500 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
