Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4J callsign genealogy
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 KO4J's current licensee, walking backwards.
- Berry, James MTNgranted 1995-08-22cancelled 2004-05-08
Successor callsigns
Callsigns held now by people who previously held KO4J.
- MURRAY, WILLIAM DALgranted 2022-06-01
All historical holders
Every license row we've seen with the callsign KO4J, oldest first.
- MURRAY, WILLIAM D AL2000-06-30 → cancelled 2002-04-02
- Berry, James M TX2024-02-09 active
- —— → cancelled 1997-10-16