Hello Brian, Thanks for your work on this. I thought that perhaps my handheld was not generating the DTMF codes correctly. I was able to record the DTMF codes into an audio file and then input the file to a spectrum analyzer program that I found on the Internet. The frequencies look correct. Based on that, and the fact that others have experienced problems, it looks like my handheld is OK. I'll be away for the next two weeks (won't be at the December meeting) but after that, if there is any way that I can help, please let me know. Jack VE3UKD