Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N9TDF callsign genealogy
Currently held by SUNDBERG, GARY L
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 N9TDF's current licensee, walking backwards.
- COTTINGHAM, ADAM FMIgranted 2014-04-04cancelled 2020-02-04
Successor callsigns
Callsigns held now by people who previously held N9TDF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N9TDF, oldest first.
- SUNDBERG, GARY L IL2003-03-25 → cancelled 2015-04-21
- COTTINGHAM, ADAM F MI2020-02-04 active