Hello Bonnie, TKS for information.
I did not find the CCIR 493-4 but I have found the Hflink Selcall list, Here is an example: SELCALL ADDRESS CALLSIGN NAME COMMENT 3300 GROUPCALL NORTH AMERICA CALLSIGN AREAS= 6/7. Moreover each equipment has its all Selcall. So a Ham can have one or several Selcalls. But who gives the Selcall number (as it seems to be a limited ressource)? 73 Patrick ----- Original Message ----- From: expeditionradio To: [email protected] Sent: Saturday, May 12, 2007 12:39 AM Subject: [digitalradio] 100 baud FSK SELCALL Re: RTTY Configurations Hi Patrick, The marine Digital Selective Calling is GMDSS (ITU-R M.493-9 to M.493-11) DSC. Hams are using the "Australian" Selcall (CCIR 493-4), an older version of this standard, with addresses limited to 4 numeric characters. This standard is used by Codan, Barrett, QMAC, Vertex, Icom, etc. It is common to Australian HF 4WD VKS737 system and other services. I believe the character coding table for the Australian Selcall is the same for new GMDSS DSC. The protocol for CCIR 493-4 is much more simple than GMDSS DSC. I have bits of the CCIR 493-4 specification, but I do not have the complete original document. When I get time to upload them, I will make the specs available on the HFLINK website soon. Bonnie KQ6XA --- In [email protected], "Patrick Lindecker" <[EMAIL PROTECTED]> wrote: > > 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 >
