Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0JJO callsign genealogy
Currently held by Olson, Jesse 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 K0JJO's current licensee, walking backwards.
- Olson, Jesse JNMgranted 2020-07-02cancelled 2020-09-04
Successor callsigns
Callsigns held now by people who previously held K0JJO.
- ORLEFF, JAMES JTNgranted 2025-03-12
All historical holders
Every license row we've seen with the callsign K0JJO, oldest first.
- ORLEFF, JAMES J MN2003-11-07 → cancelled 2005-05-24
- Olson, Jesse J NM2020-09-04 active