[Elecraft] K3 audio and rf inter reaction

[David Cutter]

The effect is also present with monitor at zero.  In this condition, a 
rushing sound is heard.  At a guess I would say it is digitally induced 
noise.



Mode: cw, paddle sending string of dots or dashes any speed
power o/p: any, ie nil to max, dummy or antenna
filter: any, but more pronounced >1kHz
listening to side tone on phones or speaker

audio control: max
rf control: start low and raise until the artefact appears

or

rf: max
audio: low and raise until the artefact appears

at low speed the artefact sounds like a scraping noise riding on the string. 
High speed it's like an extra edge.

Anyone confirm this, offer an explanation?

David
G3UNA
K3 #547