Every time a new version comes out I set up the old and new version to see if the new is an improvement in decoding. Since I have the 6500, four sessions are possible running on separate slices. I have determined that if I setup four slices [on the same frequency] and four JT-65 sessions [same version] there are differences in the decoded calls about 25% of the time. The missed calls are usually the weaker ones in the -20db range. However, have decoded signals in the -27 db strength now and then. Has anyone else tried this experiment.?