http://elecraft.85.s1.nabble.com/Noise-with-KX1-and-Powerwerx-supply-tp6999957p7003946.html
Tnx for the responses. I'm going to try the isolation approach suggested
below. Once again, I'm amazed at the depth of my ignorance (well, not THAT
> If you start looking for an alternative, try the TDK Lambda LS25-15 (for
> 1.7A), LS35-15 (2.4A) or LS50-15 (3.4A). These are switch mode power
> supplies that I've found to be fairly well shielded, light weight,
> conservatively rated, and not expensive from Newark Electronics. They are
> nominal fixed 15V supplies, but their output can be set from 13.5V to
> 16.5V. The supply is contained within a metal cage, but you will probably
> want to mount it in another enclosure with an on/off switch and banana or
> Powerpole terminals, and to protect the 120v input terminals.
>
> These are especially good for the KX1, since maximum output comes with a
> 14V power input, which most small 12V supplies can't quite deliver. Is the
> K1 the same way? They are also good for the K2 with internal battery, since
> you need 14V for proper charging.
>
> It might be hard to find any switch mode power supply that won't put some
> noise into an antenna that is sitting right next to, though. If you can
> move the antenna feed point 5 or 6 feet away from the PS with some coax you
> might have better luck. You might also get a copy of the current issue of
> QEX. There is an article in which the author details his quest to turn a RF
> noisy switch mode PS into a very quiet one.
>
> 73
> Chip
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