Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AJ4M callsign genealogy
Currently held by ROLL, FREDERICK J
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 AJ4M's current licensee, walking backwards.
- SHELBY, JAMES ENCgranted 2005-07-06cancelled 2012-07-28
Successor callsigns
Callsigns held now by people who previously held AJ4M.
- ROLL, FREDERICK JFLgranted 2010-07-09cancelled 2022-07-12
All historical holders
Every license row we've seen with the callsign AJ4M, oldest first.
- COBB, IRVIN W SC2004-07-02 → cancelled 2007-05-12
- ROLL, FREDERICK J FL2010-01-30 → cancelled 2010-07-09
- SHELBY, JAMES E NC2022-05-24 active