[Elecraft] K2 and Feedback

[David Fleming]

I have a significant feedback problem with my K2/KPA100.  When 
transmitting there feedback (sounds as clear and as loud as a PA system) 
through an attached external speaker.  The only partial solution I have 
found is to use a sea rate power supply for the K2 and NOT connect the 
power supply to ground. This makes a noticeable reduction in the 
feedback.    However, as soon as I attach the power supply to ground the 
feedback returns.   It seems there should be a solution other than not 
connecting the power supply to ground. 
Suggestions and help will be gratefully appreciated.

Dave Fleming KB3HCL