Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0JO callsign genealogy
Currently held by OEHLENSCHLAGER, JOHN G
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 K0JO's current licensee, walking backwards.
- KD0HJPcancelledWadena Area Amateur Radio ClubMNgranted 2009-04-20cancelled 2009-05-09
Successor callsigns
Callsigns held now by people who previously held K0JO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0JO, oldest first.
- OEHLENSCHLAGER, JOHN G MN2008-04-10 → cancelled 2009-02-02
- Scandia Valley Amateur Radio Club MN2019-02-15 active