[Elecraft] Laptop charger qrm

[Leo Starrenburg PA5LS]

Hello Listmembers,

after some investigation I found the source of qrm on 80m on my K2 to be
the build-in charger of my older Compaq laptop pc wich I use for
logging.

I know I can use pencil and paper or run the laptop of the battery, what
is exactly what I'm doeing now, but perhaps one of you knows a cure for
this problem ?

I tried routing / winding the powercord through a ferrite toroid, but it
didn't help.

Thanks in advance,

Leo.