I have now tossed all my Amateur switching supplies (almost). The older they got, the noisier they got.
The last one to go was the Alinco DM-330V. I really liked this as a bench supply, but its time has come. It was bad on 160M and even bad on 6M. I replaced it with an old iron Astron RS70 that I had lying around and that cleared that up. Birdies all gone. However, I did get a 30A SolidState Powerwerx from the office to test and I have to admit is is pretty quiet on HF. If you really want to be sure, limit you switching supplies and/or have a good listen to them. Mike va3mw > > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
