i just had a thought,  s your dc power cable, or the ac power cord feeding your power supply anywhere near  the coax?  sometimes you can get rf coming back into the rig bye ay  of it's dc power cable. also how do you power your leg tuner?
On Aug 12, 2013, at 9:41 AM, Mike Barnard <[log in to unmask]> wrote:

> 	I have had this problem quite a lot, I went from a long wire 
> antenna, to a 80 meter windam, fed with later line, and a 4 to 1 
> balum.  This helped some, and I also now have the heil microphone 
> that helped some.  I am using a LDG auto tuner, the kw 
> 1000.  Sometimes I can hear it a little when it is bad in the auto 
> tuner.  I have thought of getting a manual tuner, but until I get an 
> audio box to put in line for SWR I don't want to chance it.
> Last night someone recommen
> Mike Barnard
> 
> KD2CDUded a RF isolation box.  I am going to try that.  Any other 
> suggestions are welcome.