Amp mavens,
I'm just about finished building a 600 watt solid state amp (QST 6/06) and
found an unexpected problem. The cooling fans generate lots of rf noise.
They are new Orion 12vdc 4.5" fans from Mouser. Lots of bypassing caps got
rid of the noise on 20-10 meters, but it's still terrible on 160-40.
Mouser checked with Orion, which says that's just the way it is. I don't
believe it though.
Any ideas? Is a particular manufacturer known for quiet (rf-wise) fans?
Thanks and 73,
Tony, N2UN
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