I purchased some data leads for my Yaesu 450D some time ago, mic, speaker and usb plugs other end goes to data plug on back of rig. No idea of the manufacturer..in the middle of the leads is a very small box. Not sure if this contains interface or soundcard I can receive FT8. Can not transmit. Tried lots of different settings. Not able to make vox work. Surfed all the articles about 450d users setting up FT8. No settings advised seem to work, Occasionally I get a error message when wrong combination appears to have been entered. Please advise. Thanks