+ AA6YQ comments below
Found one setting in the 7610 menus to be incorrect. My fault but the (Icom) documentation was pretty vague. Anyhow, in monitoring my RTTY FSK transmission on a separate receiver or with the 7610 monitor I am now hearing what sounds like a proper RTTY signal. With virtually no RTTY signals on 20m today, was unable to make a contact to confirm operation.
+ Great! Perhaps Field Day will bring out a few RTTY ops this coming weekend.
73,
Dave, AA6YQ