Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB5M callsign genealogy
Currently held by Campbell, John S
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 AB5M's current licensee, walking backwards.
- Campbell, John SOKgranted 2020-02-03cancelled 2020-04-17
Successor callsigns
Callsigns held now by people who previously held AB5M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB5M, oldest first.
- Marsala, Nicholas B TX2013-08-08 → cancelled 2018-03-29
- Campbell, John S OK2020-04-17 active