Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W7TDJ callsign genealogy
Currently held by NYDAM, JOHN 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 W7TDJ's current licensee, walking backwards.
- Detwiler, TimothyWAgranted 2023-06-24cancelled 2023-07-14
Successor callsigns
Callsigns held now by people who previously held W7TDJ.
- NYDAM, JOHN WORgranted 2020-10-19
All historical holders
Every license row we've seen with the callsign W7TDJ, oldest first.
- NYDAM, JOHN W OR2000-03-28 → cancelled 2001-01-13
- Detwiler, Timothy WA2023-07-14 active