Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N0TJR callsign genealogy
Currently held by GRABAU, MARY K
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 N0TJR's current licensee, walking backwards.
- Redmann, Trent JMNgranted 2016-03-11cancelled 2016-03-29
Successor callsigns
Callsigns held now by people who previously held N0TJR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N0TJR, oldest first.
- GRABAU, MARY K MT2002-04-17 → cancelled 2014-07-15
- Redmann, Trent J MN2026-02-19 active