Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9GTM callsign genealogy
Currently held by JOHNSEN, CHARLES J
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 K9GTM's current licensee, walking backwards.
- Dunn, SeanNJgranted 2011-04-21cancelled 2011-05-24
Successor callsigns
Callsigns held now by people who previously held K9GTM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9GTM, oldest first.
- JOHNSEN, CHARLES J IL1997-09-09 → cancelled 2009-09-10
- Dunn, Sean NJ2021-02-25 active