> If you use a modern switch-mode power supply from a reputable > manufacturer, you should not have any noise problems.
The smart money would be to actually check the supply. I've got some duracomm, astron and a few other current brands that make more broadcast band poop than a new IBOC transmitter. "IBOC" to you non broadcast people is a bad thing for everyone. > Some of the postings allude to "noisy" switching power supplies, > but those problems were common a decade or so ago, not today. Not say I from the man in the back room. (starting to write like O'riley) > I use a Yaesu-branded Samlex switch-mode power supply for my > Yaesu FT-847 HF rig, and I have zero noise from it. You might have found an example of a well made supply. Cheers to Yaesu for doing one right... > My spectrum analyzer shows that it is clean on every Ham > band. I'd be curious to know what type of antenna or probe you used below 30 MHz? Ham bands are not the only location I would be concerned with. But... even a loud - bad switcher doesn't really hose up typical VHF High Band or UHF FM Operation that bad. > I also have several Astron and Duracomm switchers, and they, > too, are free of measurable broadband noise. The noise doesn't have to be broadband... just some unwanted buck-shot where you need/want it least. Sometimes the garbage will hose you up and you don't know it's the reason for poor performance at some other location. Life will go on... cheers, s.
