[Elecraft] OT 20M Moving QRM (Video)

[David Ahrendts]

Thanks, everyone, for weighing in. I’m armed with $95 of ferrite snap ons and chokes and two MFJ heavy duty AC filters! Saturday I plan to carefully re-design all of the AC wiring in my office/shack which is, admittedly, a hodgepodge of extension cords and power strips with at least 5 wall warts. I suspect the offending switching PS runs the brand new LG display used with the K3S SVGA. It’s a small, light little thing. Runs very hot. Most likely will be replacing it with a linear wall wart or something cleaner.
 
I found this article that explains the differences between linear and switching power supplies:  http://www.clever4hire.com/special-articles/home/ac-dc-power-supplies---using-wall-warts

Will report back.

David A., KK6DA 


> On Mar 3, 2016, at 10:05 AM, David Ahrendts <davidahrendts at me.com> wrote:
> 
> Does anyone recognize this moving QRM? Last evening 6:30pm. Band is dead. Ambient noise pretty calm. But notice the slowly moving noise bumps on the K3S SVGA display. Might this be weather radar?   https://vimeo.com/157616344 
> 
> David A., KK6DA, LA
> 
> 
> 
> David Ahrendts   davidahrendts at me.com   
> 
> 
> 
> 
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David Ahrendts   davidahrendts at me.com