Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB9LO callsign genealogy
Currently held by Onsager, Ralph W
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 AB9LO's current licensee, walking backwards.
- Onsager, Ralph WWIgranted 1996-02-27cancelled 2005-11-09
Successor callsigns
Callsigns held now by people who previously held AB9LO.
No current licensee on record previously held this callsign.