[Elecraft] 25A power supply question

[Jim Bennett]

Mike,

I've had the MFJ-4245MV supply for several years and think it is an OK PS. I detect no crud on any of the bands when powering my K3 with it. However, I normally use a solar / battery system and the '4245 doesn't get a lot of use any more. One thing that is annoying about it is that the fan runs at high speed all the time, right from power-on to drawing full current for several minutes. That's my only complaint about it. There was an article somewhere on the 'net about a mod to one of the other MFJ supplies to make the fan operate like the K3, based on heat. But, I'm pretty sure it was NOT for this '4245 model.

Jim / W6JHB



On   Friday, Nov 8, 2013, at  Friday, 10:45 AM, Mike Dodd wrote:

> 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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