Codan 8580 Modem

The term "Codan 8580" frequently shows up in connection with the CCIR 493-4 related selective-call system used by several radios manufactured by companies such as Codan, Barrett, Q-Mac etc.!

This is however a misnomer!

The "Codan 8580" modem is only capable of transmitting the following modes:

SITOR-A (100 Bd FSK ARQ mode, 170 Hz shift, based on CCIR 476-4)
SITOR-B (100 Bd FSK, 170 Hz shift, collective FEC mode based on CCIR 625)
SELFEC (100 Bd FSK, 170 Hz shift, selective variant of SITOR-B)*

*SELFEC is a slight modification of SITOR-B, where the traffic is directed to specific recipients whose selective call is being transmitted as part of the data stream.

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