Originally Posted by tpreitzel
I've ordered a cable for exactly this purpose. I have a 12v DC power supply (4A) and this cable will step down the voltage from 12v to 5v/2A continuous output. However, this item originates from China and won't be here until the middle of January unfortunately. How much noise this 12v to 5v adapter will introduce into the environment remains to be seen. At least, I'll be able to remove power to my main PC and thereby eliminate the noise from it.
2 amp converters from china could be Switch mode types.
As you know, we need Linear ones for lower noise etc even as you try to use radio while charging.