[Elecraft] Reliable DC Power Supply for K3/P3

[Eugene Balinski]

The model number of an Astron PS is the PEAK supply
current.  An RS-35M is a 35A PEAK, 25A Continuous supply.
  The RS-20 is 20 peak, 16 continuous 


http://www.astroncorp.com/showpage.asp?p=2

73
Gene K1NR

On Tue, 19 Nov 2013 08:33:51 -0800 (PST)
 Hisashi T Fujinaka <htodd at twofifty.com> wrote:
> The only thing that bit me: Astron XX does not mean XX
> amps. I have an
> Astron 25M and I was trying to figure out why my K2/100
> would power off
> on 15M at 100W when I finally figured out that that the
> Astron 25 is a
> 20 amp power supply and my K2 needed a bit more. It would
> even fold
> back the voltage. After more debugging (and lots of
> bypass caps &
> chokes and dummy loads and a brand new oscilloscope) and
> I found that RF
> in the shack could be part of the problem but just
> swapping to an Astron
> 35M was my fix.
> 
> Unfortunately, the Astron puts out a lot of heat, and my
> shack happens
> to be in a room that gets pretty warm even with the A/C
> on. So I changed
> to a 25A switching power supply which unfortunately has a
> fan. Now the
> tradeoff is heat vs. fan.
> 
> On Tue, 19 Nov 2013, Don Wilhelm wrote:
> 
> > Bob,
> >
> > The old reliable Astron 35 is a very good linear supply
> - I do not have the 
> > metered version, and mine sits quietly on the floor
> under the desk, no need 
> > to look at meters there.
> >
> > I also have an Astron SS30 which does a great job at
> the workbench. Again no 
> > need for meters, and even though a switcher, I have not
> found any switching 
> > noise created in the ham bands.
> >
> > As backups, I have an MFJ 25 amp switching supply and
> an Alinco 340M linear - 
> > the advantages of those supplies is that the output
> voltage is front panel 
> > adjustable.  No noticeable noise from the switcher and
> the current is more 
> > than sufficient for the K3/100.
> >
> > If you have other accessories, you might want to look
> at a 35 amp supply, but 
> > 20 or 25 amps is all that is needed for the K3.
> >
> > 73,
> > Don W3FPR
> >
> > On 11/19/2013 9:35 AM, Robert Nobis wrote:
> >> I m about ready to place an order for a K3 and P3, and
> wonder if there are
> >> recommendations on a reliable DC power supply for the
> Elecraft 100-W
> >> transceiver.
> >> 
> >> 73,
> >> 
> >> Bob  - N7RJN
> >> 
> >> 
> >>
>
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> -- 
> Hisashi T Fujinaka - htodd at twofifty.com
> BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03)
> + $2.50 = latte
>
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