KX3 has a ping noise

[VE3WDM]

Good afternoon all,  while operating my KX3 when the keyer is released I hear a "ping" in my headphones. It happens on 21, 28 and 18Mhz, I have changed the headphones and also put the KX3 on a dummy load as well. Not sure if I inadvertently tuned on some type of option?
Mike
VE3WDM
     
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[ne5dl]

Mine a has a similar effect that I noticed during /P in QRPTTF yesterday.
Possibly RF getting back into the rig ? Was using open wire feedline and a
4:1 balun.

72, Dave
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[VE3WDM]

Hi Dave thanks for taking the time to get back to me. I thought the same but it also does in with the dummy load as well with the power set at 0.
Mike

[VE3WDM]

It's all figured out....I had dual watch on (not sure how that happened) it seemed when VFO B was close to VFO A then the ping effect happened. Turned off dual watch and all is well now.
Mike