Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9JXO callsign genealogy
Currently held by CARLSON, JOHN M
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 W9JXO's current licensee, walking backwards.
- Carlson, John MMNgranted 2016-07-21cancelled 2016-08-09
Successor callsigns
Callsigns held now by people who previously held W9JXO.
- Carlson, John MMNgranted 2018-03-20
All historical holders
Every license row we've seen with the callsign W9JXO, oldest first.
- CARLSON, JOHN M MN1998-06-01 → cancelled 2010-06-02
- Carlson, John M MN2016-08-09 → cancelled 2018-03-20