On Jul 16, 2010, at 5:35 PM, Tom W8JI wrote: >> My concern for any Switching supply is the RFI noice that the >> radio will >> pick up >> from the power supply. Looking at the SEC 1235m, I was reading >> that it has >> a >> build in RFI filter. Plus I like the AD5X mod to slow down the >> fan. And >> the >> Alinco DM-340 MVT has a knob to change the freq. of the noise that >> the >> radio is >> picking up. > > Any power supply that has a VFO knob built in means they either > don't know > how to get harmonics down to the proper level or don't want to > spend a few > bucks on components, so they took the cheap way out. > > I have several switching supplies and can't hear any of them > anywhere unless > I run an antenna right in the room.
I have an Alinco supply and have never found any birdies which could be changed by that knob, so I feel that it is pretty clean. After fighting some of the birds I did have for years, I switched from a CRT to a LCD monitor and nearly all the birds disappeared. Bob, N7XY ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
