I have just come back to RTTY and am using my Flex 6700 or the 6500 in the last 2 DL contests. But I have been using digiU, and it works perfectly, so why has RTTY used lower sideband and actually does it really matter which sideband is being used.? As a matter of interest I use FLdidgi and MMTTY at 2125hz. Regards to all Ross ZL1WN