Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N7SDT callsign genealogy
Currently held by SCHAEFER, ZITA F
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 N7SDT's current licensee, walking backwards.
- Thompson, Schuyler DWAgranted 2018-12-04cancelled 2018-12-22
Successor callsigns
Callsigns held now by people who previously held N7SDT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N7SDT, oldest first.
- SCHAEFER, ZITA F MT1991-06-18 → cancelled 2003-06-19
- Thompson, Schuyler D WA2018-12-22 active