[Elecraft] PX3 Anomaly?

[Ian Kirkpatrick]

Hi,
I have recently purchased a new PX3 for use with my KX3.In CW mode in the waterfall display there appears a distinct black line 600hz to the right of the carrier, the black line is 50hz wide.Is this normal or is there a fault with the PX3 or is there something I have not done in setting upprocedures?I will be grateful for any guidance.Regards,IanG4WTF