Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF0JTF callsign genealogy
Currently held by IRWIN SR, MICHAEL W
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 KF0JTF's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KF0JTF.
- IRWIN SR, MICHAEL WKSgranted 2022-12-02