On Sun, December 3, 2023 3:59 pm, Cecil Lale via GreenKeys wrote:
> I have a dovetron MPC 1000R with 60hz hum on the Afsk output. I changed
> all the diodes and filter caps in the power supply. The hum is still
> there. Any ideas? I did not change the 2 15volt regulators.thanksCecil
> KF6ZOK


I wonder if it's a ground loop issue. If you disconnect the audio output
from any other equipment, and then connect some headphones to the audio
output, do you still get hum?

Harold
https://w6iwi.org

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