The "you shall identifiy yourself with you callsign" parts of most radio licenses, don't seem to have kept up with technologyZL4JOCO wrote: ↑Thu Aug 17, 2023 10:26 amThanks. That all makes sense. So from a proper identification and "destination" angle I presume you need to have a callsign that works in these rules or a secondary that will work? I'm thinking AX25/APRS and packet radio more broadly here. I'm new to all this so also trying to understand the conventions and "rules". Once of which is normaly "you shall identifiy yourself with you callsign".
No one sends their callsign when using DMR. They send a number which you can resolve to a callsign by looking it up in the appropriate database.
In general digital radio signals can't be decoded without the required hardware or software.
There are loads of signals on Ham Radio bands that I can't decode because I don't have D-STAR or NXDN or P25 radios
Additionally there are home brew standards like M17 which various groups made up themselves and are not international standards, like DMR is via its ETSI standard.
I presume I can make my own M18 mode / standard if I want, I presume if I publish my data protocol it would be OK for me to use this mode
But possibly each licensing authority keeps a list if digital modes that people are allowed to use, but I think most licensing authorities don't have the resources to do this.