Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA1RL callsign genealogy
Currently held by MORTENSEN, KARL E
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 KA1RL's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KA1RL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA1RL, oldest first.
- MORTENSEN, KARL E RI2007-08-02 → cancelled 2019-09-18
- THREET, KARL W TX2026-07-14 active