On Sun, 13 Dec 2015 09:04:46 +0000, Brian-Gaff wrote:

Two devices bought this week. Both work OK but the problem is that their
power supplies being of the switch mode kind push out lots of annoying
RF at frequencies between 100khz and around 20mhz. One of my hobbies is
listening to the short waves and even medium and long waves, so its all
a bit depressing to find that in order to continue both items need to be
off.


Yeah, those cheap Chinese switchers are a menace. You need a linear
supply you reckon? Try these:

http://www.maplin.co.uk/search?text=...supply&x=0&y=0