[Elecraft] (OT) - Unplanned Discovery

[Doug Smith]

I have often wondered if the noise from a switching power supply would vary in intensity or other characteristics as the load changes.  For example, during transmitting.  In a single transmitter environment the user would probably not notice but in a multi-transmitter or SO2R station one just might.  

Changes in noise floor might not always be “phase noise” from the other transmitter — could it be different emissions from a switching power supply under full load?

73,
Doug, W7KF
http://www.w7kf.com <http://www.w7kf.com/>


> On Nov 19, 2017, at 6:42 PM, stan levandowski <sjl219 at optonline.net> wrote:
> 
> Yeah, me too.  I bought it because I thought it would be "super clean" and really small.  But its contribution to my problem was pretty much unarguable:  Plug it in and I hear noise.  Unplug it and I don't hear noise.  The instructions that came with it specifically stated that the Kx33 should be placed the full length of the DC plug/cord away from the transceiver.  I did that but it didn't work for me.  I tried different outlets around the house too.  I put chokes on it.  No joy.
>