Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD1ZD callsign genealogy
Currently held by THOELEN III, ROBERT E
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 KD1ZD's current licensee, walking backwards.
- N1SZTno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KD1ZD.
- THOELEN III, ROBERT ECTgranted 2015-07-11cancelled 2022-06-04