Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1JAL callsign genealogy
Currently held by DEFENDERFER IV, ROBERT C
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 N1JAL's current licensee, walking backwards.
- Liebelt, JoergCAgranted 2021-05-17cancelled 2021-06-04
Successor callsigns
Callsigns held now by people who previously held N1JAL.
- Liebelt, JoergCAgranted 2021-06-25
All historical holders
Every license row we've seen with the callsign N1JAL, oldest first.
- DEFENDERFER IV, ROBERT C MA2001-04-06 → cancelled 2013-05-15
- Liebelt, Joerg CA2021-06-04 → cancelled 2021-06-25