On 7 jul 2009, at 18.53, DM5TI Gerard Jendraszkiewicz wrote: > 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.
I do have the same problem of my K3 picking up line noise from a SPE 1K-FA amp. Bypassing the input trafos as suggested seems to have helped some. I also tried the TX equalizer as suggested, but it did not make a difference in my case. Another way to reduce the hum is to use the TX noise gate (Config Menu: TX GATE) which will effectively kill the hum between words. It won't solve the source of the problem, but it will minimize the effect of it as most of the line noise is amplified by the compressor between words. I have set my gate to 10. 73 de Björn, SM0MDG SE0X ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
