Sorry, I don't know what you mean? It is a standard nostr note. It is publishing to relays, nothing more. A signed nostr note just like a normal client. Nostr relays to prop gate from relay to relay typically. That is done at the client level. There is no such thing as a client that reads a ham radio callsign, nor would a relay use this information.

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My understanding was relays don't forward notes to other relays -- only to the client requesting the note. That is where store and forward seems like it would be necessary in order to tie a ham-enabled relay into the broader nostr ecosystem, allowing hams to access nostr as clients without an internet connection. But, it isn't immediately clear how that store and forward would be established while maintaining the structure of notes and their apparent origins. I think I need to do some reading.
Ahh. I thought it was essentially a single relay that was accessible via radio and internet, but sort of limited there (which is very cool in itself, but not quite as extensible as being able to relay traffic to and from other relays. Once I'm licensed (and more importantly, have equipment -- the licensing is cheap; the equipment less so!) I definitely intend to play with it a bit!