[Elecraft] k3 50Hz background noise

Igor Sokolov ua9cdc at gmail.com
Wed Oct 21 12:35:13 EDT 2009


My friend, K3 user is getting ready for CQWW SSB. In his installation the
rotator control box that has pretty large transformer inside.  The box is
only few inches away from one of the two K3s  and cannot be moved. He has
discovered that magnetic field created by this transformer interacts with
the AF transformer (Line in) in K3. The indused 50Hz noise is only 20db down
from the audio signal. The noise is gone when line in is switched off in the
menu but that leaves him without voice keyer which is tough to be deprived
of in 48 hours SSB contest. Has anybody found a solution yet. He now thinks
of taking the transformers out of the radio an bypassing them. He thinks
that the problem roots to the fact that the K3 cabinet is made of aluminum.

73, Igor UA9CDC



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