[Elecraft] 25A power supply question

[Peter Chamalian W1RM]

I went through the same thing last year.  I was using a Astron 50 amp supply
but the heat it threw was driving me out of the shack.  After research, and
the strong recommendation of several K3 owners, I purchased two Powerwrex
SS-30DV.  These are 25 amp continuous duty switching supplies with a 30 amp
surge.  Very quiet and little heat.  I have one to power the K3 alone and
the other to power the rest of the 12 volt gear that I use.  Not a lick of
any trouble and no noise at all and the price is quite reasonable.

http://www.powerwerx.com/power-supplies/powerwerx-30-amp-desktop-switching-p
ower-supply-powerpoles.html?utm_source=googleShopping&utm_medium=googleShopp
ing&utm_campaign=googleShopping&gclid=CPrskYP_1boCFcnm7AodThsA_g


Pete, W1RM


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Mike Dodd
Sent: Friday, November 08, 2013 1:45 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] 25A power supply question

Hello to the list from a first-time poster.

I have a KX3, and have a KXPA100 amplifier on order. I see that my 20A 
Tripp-Lite linear power supply isn't sufficient to power both of these, 
so I'm researching other supplies.

Astron seems to be the gold standard, but I also see some MFJ supplies. 
The 3045MV is a 30A linear supply, and looks good from the specs. Any 
opinions on this one?

MFJ also has the 4245 45A switching supply, and the DX Engineering 
catalog says, "No RF hash? These power supplies are clean!"

Are they really clean? I don't want ANY hash spoiling my quiet location, 
and will avoid any switching supply that creates receive noise. Does 
anyone have experience with this line of MFJ switching supplies?

What about the Astron ASR-SS-30M 30A switching supply. Quiet or noisy?

Should I even consider a switching supply, or stick with a linear model? 
The Astron ASR-RS-35M looks good, albeit more expensive than the MFJ 3045MV.

Thanks for any information.
-- 
73, Mike N4CF
Louisa County, VA USA
Elecraft KX3 #3118, 10W
Carolina Windom up 45'
http://n4cf.mdodd.com
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