[Elecraft] KPA500

[Alan Bloom]

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" <faunt at panix.com>
> To: <RMcGraw at Blomand.net>
> Cc: <don at w3fpr.com>; <M0XDF at Alphadene.co.uk>; <elecraft at mailman.qth.net>
> 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" <RMcGraw at Blomand.net>
> >   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" <w3fpr at embarqmail.com>
> >   To: "David Ferrington, M0XDF" <M0XDF at Alphadene.co.uk>
> >   Cc: <elecraft at mailman.qth.net>
> >   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
> > 
> 
> 
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