[Elecraft] Power Supply for K2

Sat Jan 26 00:23:10 2002

John:
  I've used the 22-504, and it seems just fine.  It's not a switcher and it 
doesn't make any noise that I've heard.  It is a bit big and heavy, of 
course, relative to the switchers.  I've also used the 22-503, switcher. 
It does make noise: a walking hash about every 100KHz.  But it's a problem 
only if you have open antenna lead near the supply.  When I use it at home, 
where the transmatch is about 25 feet of coax away from the supply, there 
is no problem at all.  The cheapest decent supply I've found is the Elpack 
WRI4212 that I got for about $12.50 from, I believe, All Electronics. It's 
voltage is adjustable.  They may still have some.  It is very quiet, and 
about half the size and weight of the 22-504.  The smallest, lightest 
supply I've found is the 4.16 amp, 12 volt PhiHong supply, model 
PSA60W-120. It's available from Mouser, and it's about the size of a pack 
of cigarettes.  Some people said they got noise out of theirs.  I've had no 
such problem unless my antenna lead is wrapped around the power supply. 
It's voltage is not adjustable.

best wishes,

dave belsley, w1euy

--On Friday, January 25, 2002 7:36 PM -0800 "John Grebenkemper, KI6WX" 
<[email protected]> wrote:

> Has anyone used the 3 amp 12V regulated Radio Shack power supply (22-504)
> to power their K2?  Any problems with noise?  Any other recommendations
> for an inexpensive K2 AC supply?
> -John
>  KI6WX
>
>
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----------------------------
David A. Belsley
Professor of Economics