Hi. I read [RTTY] FT920 and FSK RTTY on the web. I did have same trouble. But now it is ok . How to use MMTTY 1.65 with FT-920 is as below. U-42 Change to "Hi2125U" MMTTY recieve mode change to "REV". That's it.U-43&U-44 are no change. If you stil have the trouble , please try. 73 de JP1LRT Yoshiharu Tsukuura