[Elecraft] Power Supply for K2

[Dave Gingrich K9DC]

At 19:36 1/25/2002 -0800, John Grebenkemper, KI6WX 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-

You didn't say if you have the KBT2 installed. To keep the battery charged 
you need to end up with 13.8 - 14.2 indicated on the K2 battery display 
(actual supply voltage about .5 higher). See the battery care and feeding 
doc on the website.

I carry a Phihong PSS-45W-150 laptop style switcher. I think I paid about 
$25 from Mouser. 15 volts regulated, rated at 3.4 amps, weighs about 6 oz. 
A diode installed in the cable drops the voltage about .5, and I end up 
with 13.9 indicated on the K2.

The supply does produce a little noise if I connect the antenna directly to 
the rig (no coax), but no noise is noticeable on any antenna away from the 
radio.  If noise is a problem, I run on the battery and use the supply to 
charge the battery when not operatng.

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Dave Gingrich, K9DC - Indianapolis, Indiana  USA
K2 #2211, K1 #931, QRP-L #2376, ARS #1109,
FPQRP #389, IRLP #473, k9dc.ampr.org, CCIE #6748
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