First off, I'm looking to power my 818nd. When I plug in the supplied wall wart, I get a lot of noise on 80 meter. So I'm looking for a quiet alternative and thought I'd run through some of the useless junk I have laying around before buying anything. I have several old laptop power supplies. If I use some kind of voltage regulator to get the voltage to 12-13, will it still be noisy? I also have an old unused ATX power supply. Was going to connect everything up and see if it's noisy, but the 12 volt out was fluctuating between 9.8 and 10.5 (maybe it needs a dummy load on the 5v?), so I chickened out. Are either of these worth pursuing if the goal is quiet power?