Hi Folks,
Thanks for the help so far

A follow up on my experience.
Have put rig control on USB and using comport for rigblaster.

Now : can RX ok on all dig modes. However I can't hear any sounds from the
external speaker plugged into the back of the rigblaster when I TX. The 850s
does put out a signal alright.

any info appreciated
de Denis EI6HB