Hello Bonnie, Do you mean that it is the same system as GMDSS DSC used for digital selective calling system for use in the maritime mobile service? (ITU-R M.493-11 recommendation)
73 Patrick ----- Original Message ----- From: expeditionradio To: [email protected] Sent: Friday, May 11, 2007 10:39 PM Subject: [digitalradio] 100 baud FSK SELCALL Re: RTTY Configurations > Does anyone run 100wpm ASCII RTY anymore? There is increasing use of 100 baud FSK SELCALL in ham radio. This is HF SELCALL CCIR 493-4 (Australian Selcall). HFLINK maintains a database listing of operators using it: http://tech.groups.yahoo.com/group/hflink/database It is similar to Marine DSC (ITU-R 493-9) which is also 100baud FSK. It is only used with USB (upper sideband), and the mark (lower) frequency is fixed at 1700Hz. It uses FEC, and it is a very robust system. Bonnie KQ6XA
