David Woolley (E.L) wrote: > Guy Olinger K2AV wrote: > > >> stuff available) switching supply that.. >> >> 2) is completely noiseless at RF frequencies. >> > > Not physically possible for a switching supply; you need to specify > acceptable, non-zero levels of RF noise. > > Absolutely correct Guy, I followed the long thread a while back about power supplies to try and learn what others had done to help with switchers. I find it true as you say its impossible, one can only bring the switcher noise down to some acceptable level, with many beads and by pass caps etc I finally have the noise down almost to the point it is covered by antenna noise on each band. Some supplies it was not possible to do that even. The P3 will open a lot of eyes as to what is really power supply broad band noise and what is real atmospheric noise. It will show that up quite well. Maybe some hams will find their s5 and higher noise levels are self generated and be able to lower that by several DB. A whole new world of DX will await. Or just go back to a old heavy transformer type supply and be almost noise free. 73 Merv KH7C ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected]
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