" from a 12V battery that is floated by a small linear supply. (A year or
so ago, I went through my home and got rid of all the switch-mode crap).
At last count, I have more than a dozen linear supply replacements here.
Some are built into consumer A/V equipment, others are used to power
routers, Ethernet switches, cell phones, etc. I like the PowerOne, Condor,
and International Power branded open frame "OEM" supplies. I grab extras
any time they come available on the surplus market - and often for well
under new prices from Mouser and Newark.
Tackling EMI is always a maddening exercise here. If there's the slightest
noise bump on a panadapter display, I can't rest until it's gone. Just
this morning, I replaced what I thought was a quiet Toshiba laptop supply.
It was being used to power a low-power SDR transceiver. All was fine until
I ventured down to the middle of the AMBC band this morning. The grunge
level increased over 30 dB when compared to 160m.
Paul, W9AC
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