Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB5SF callsign genealogy
Currently held by WIDMER, LARRY F
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 AB5SF's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AB5SF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB5SF, oldest first.
- TRUELOVE, VAN TX2003-10-07 → cancelled 2016-01-05
- WIDMER, LARRY F NM2018-11-10 active