[Elecraft] Alinco switched-mode power supply from RSGB

[Bob Nielsen]

On Jan 17, 2008, at 8:16 AM, Stewart Rolfe wrote:

> Hi all,
>
> The enjoyment of my new K3 was being severely compromised by an old  
> linear power supply whose fan sounded like an old vacuum cleaner  
> and whose transformer buzzed loudly in time with my cw at any  
> powers above about 20 watts.
>
> So I decided to take a chance on a switcher and bought the Alinco  
> DM-330MW on offer at the moment in RadCom for 79.95ukp (RSGB  
> members) until the end of February. What a difference.....the  
> silence is deafening! I can now hear the K3's dulcet sidetone and a  
> quick flick across the bands has not shown up any obvious switching  
> noise either.
>
> It's small size and weight makes it an ideal companion to the K3  
> and the duo would make a great combo for a field day or dxpedition.  
> I'll reserve final judgement until I've used it a couple of weeks  
> and had a good check for digital nasties but it looks very good so  
> far.....
>

I have had my Alinco DM-330 for several years (it replaced an Astron  
linear supply) and have been quite happy using it with my K2.  The  
adjustable output makes it easy to supply sufficient voltage for  
charging the internal battery and I have never noticed any switching  
noise.  There was a review in QST which showed a much cleaner  
spectrum than most of the other supplies they tested.

Bob Nielsen
n7xy at clearwire.net