[aprssig] APRS callsign minimum length

Tapio Sokura oh2kku at iki.fi
Sun May 17 14:31:02 EDT 2009

Robert Bruninga wrote:
> (Remember that APRS callsigns cannot be shorter than 3 bytes).

Where in the spec is this mentioned? I can't remember where and didn't 
find it by having a quick look..


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