[Elecraft] Which of these would make the best power supply for the K3(S)?

[jim]

I worked as an engineer and in marketing for a major power supply company.

I did many design reviews and cost analysis on various MW power supplies.

The designs are straight forward and their derating guidelines were not as
robust as the ones I used.

One area that they "just met spec" was for conducted EMI.  You need a unit
that meets level B, with VDE level B most stringent.  The products I
designed had a minimum of 6 dB margin on conducted EMI.  Robust EMI
filtering costs money.

Ripple current in the electrolytic caps of MW is also pushed hard.  In some
cases, they use 85 versus 105 degree Centigrade capacitors, again for lower
cost.

In your application, I suspect you will not be running at 50 deg C ambient,
so that in itself will provide derating to the power supply.  

Artesyn makes a standard product line of power supplies sold through their
distribution channel.  They are good, very good, and easily meet all their
published specs with margin to spare (especially EMI).  If you used one in
your shack, it will outlive you.

I am surprised that people that own one of the best amateur radio
transceivers in the world, would put a weak link in the chain of the overall
system.  But then again, I am out at 4 sigma on the curve and companies
typically do not design for my "needs"  ;>)

Jim
W6AIM



.
-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Peter
Pauly
Sent: Thursday, October 29, 2015 4:52 AM
To: Elecraft Reflector
Subject: [Elecraft] Which of these would make the best power supply for the
K3(S)?

I'm looking at the Meanwell power supplies because they are cheap and seem
to be well regarded. I've come up with these two choices, feel free to give
more suggestions of other models. I've seen talk on this reflector of
supplying more than 13.8V to the K3S so that's why I'm looking at the 15V
model.

12V Model:   Meanwell NES-350-12
Voltage range 10-13.5V
29A


15V Model:   Meanwell NES-350-15
Voltage range 13.5-18V
23.2A


The 15 volt model would seem to be the obvious choice, except that it
doesn't supply the recommended 25 amps. The K3S manual says 22 amps typical
though.

Is there another model Meanwell I should be looking at that has better
protection or filtering?

I've already got an Astron switching power supply, the Meanwell would be a
second alternative.
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