[Elecraft] [K3] Hum JT65/JT9 and Vox. Resolved.

Larry Lopez lawlopez3 at gmail.com
Sun May 11 17:03:35 EDT 2014


This is actually covered already but I need to mention it.

When the WSJTX waterfall started losing signals into the noise
I noticed that there was a neat periodic set of signals that
lined up with the frequency ticks.  Eventually it dawned on me
that they were 120 Hz apart and eventually I found a 60 Hz
fundamental.

What I found is that the the line out was picking up the
linear power supply that was behind it.

What I also found out was that as the K3 got closer the
the transmitter came on.

So the magnetic field from the current spikes
from the diodes in the power supply were being picked
up line transformers in the K3.

So I moved the power supply.

Since the transformers get rid of ground loops I wouldn't complain too much.

End of Story.

PS it was really unnerving to move the K3 and have it turn on.





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