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What happens when you connect a 12V battery?
On Friday, October 4, 2019, 9:28:51 AM EDT, Evan Hand <elhandjr@...> wrote:
Most Laptops do not have an earth ground. You do have the shield of the USB port, however that would not necessarily ground for AC interference.
It was just a suggestion for a possible cause for the hum disappearing when the uBITX is connected, as the shield of the coax is usually at earth ground.
Good luck and