On Tue,7/21/2015 9:16 AM, Charlie wrote: > I have an adjustable 0-4kv, 0-2.5Amp SMPS. It has a switch freq of 18 khz. Most SMPS units generate a lot of RF noise. Have you listened for it in your station RX? It's possible to build quiet ones, but they're few and far between. 73, Jim K9YC