[Elecraft] Switching Power Supply Recommendations Wanted

[Bob Nielsen]

On May 25, 2007, at 7:04 AM, Solosko, Robert B (Bob) wrote:

> Hi Elecrafters,
>
> 	I just sold my big, heavy linear power supply to replace it with
> a small, light weight switching supply that I can pack into a suitcase
> with my K2/100. Looking at the eham.net reviews, comments on all of  
> the
> switching supplies seem to range from "great, absolutely no switching
> noise" to "noise everywhere", and everything in between. Given the
> sensitivity of the K2's receiver, is power supply switching noise  
> likely
> to be more of a problem with the K2 than with some other rigs? Are  
> there
> any switching power supplies that you'd recommend that work well with
> the K2 (and have little or no switching noise that the K2 would  
> pick up)
> and are there any that I should definitely avoid?
>

There are several product reviews on various switching power supplies  
available to ARRL members on the ARRL web site.  The January 2000 and  
September 2000 issues, in particular, did a number of comparisons  
showing noise spectrum.  Based on those reviews, I bought an Alinco  
DM-330MV.  It has a knob to adjust the switching frequency in case  
there is a noise problem, but I haven't found any noise that either  
my K2 or my TS570D can detect. I also have a MFJ-4103 which I use for  
travelling with the basic K2 (very small, 120/240 volts input) and  
haven't had any noise issues with that one either.

73 - Bob, N7XY