[Elecraft] New 30A power supply on Elecraft order form

[Howard Hoyt]

Hi all,
In the last Elecraft digest, regarding noise of the Powerworx switching 
supply, it was posted:

 >>Check out the 25 eHam reviews.
 >>It's not without issues for some reviewers.
 >>Mostly RFI on some HF bands and fan noise.

And notably Wayne posted:

 >>results with switching supplies can vary with type of antenna feed.
 >>For example, I wouldn't use a switcher if you have no choice but to
 >>use an random wire leading directly from window to rig. Good
 >>grounding can also help. I'm not sure if a 100% noise-free 30-amp
 >>switcher has ever been designed...

As a manufacturer of a compact switcher for HF transceiver use, we have 
performed a LOT of testing on this issue.  A short summary of our 
findings is on our website on the FAQ tab at:
https://proaudioeng.com/products/pae-kx33-ac-power-supply/

To summarize, common-mode current due to antenna system issues does 
indeed play a role in apparent switching supply noise.  Please read the 
FAQ for more.  I don't want to post it here due to it's promotional content.

Cheers & 73,

Howie - WA4PSC