Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB9YU callsign genealogy
Currently held by KOEBEL, COLIN M
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by AB9YU's current licensee, walking backwards.
- Koebel, Colin MILgranted 2005-09-16cancelled 2011-03-09
Successor callsigns
Callsigns held now by people who previously held AB9YU.
No current licensee on record previously held this callsign.