In disassembling a very old original Apple external CD player I came across a
big ferrite core. I thought this would help solve the problem with
2 meter band
interference from the Das Keyboard. And indeed, there is a lot less
interference on the 2 meter amateur band. I tested with the Wouxun KG-UVD1P
radio tuned to
145.500 MHz and I had to put the antenna of the radio real close to the
keyboard to hear interference with the squelch set at 5.
I notified the makers of Das Keyboard of this problem and my solution. The
reply was a bit non-committal they will forward the suggestion to development.