[Elecraft] K3 Line In hum

Gerard Jendraszkiewicz jend at uchicago.edu
Tue Jul 7 12:53:35 EDT 2009


Hello,

I wonder if anyone else experienced this type of problem and has a 
possible solution ?

Independent of any connectiions I found out a 50Hz hum on my Line-In 
audio. After a long investigation I figured out
it was a coupling with other transformers external to the K3.  The 
transformer of my ampliflier ( 10" away from my K3 ) couples an audible
50hz hum into the Line-In input. It seems the small isolation 
transformer in the Line-In line is prone to pickup of
50Hz/60Hz magnetic field. Always I'm able to simulate it with other 
transformers.

Increasing the distance from the K3 to the amplifier is not an option as 
my shack space is limited. Any sugestions to prevent it?

73 Harry DM5TI



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