Icom 706 MKIIG: 17 & 15 meter bands, USB or LSB mode, when the mike is keyed the radio puts out no audio and the SWR my meter deflects to infinity and a full ouput carrier is produced as though AM mode selected. All other bands and modes operate normally. I have a second MKIIG for comparison that operates normally on 17 & 15 using the same antenna, leads and all other. So I have concluded it is within the radio. Anyone seen this condition? Any ideas?