Forums Recent Posts Forums Discussions Digital Modes WSJT-X Notifications Clear all WSJT-X Last Post RSS Glenn Thompson (@ac0m) Active Member Member Joined: 2 years ago Posts: 15 Topic starter January 10, 2021 3:29 pm I was working FT4 on 20 meters today and got this reply: AC0M TG9ANF RR73 a3 from the station I worked. Any idea what the a3 at the end means? Quote Share: