Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6TSZ callsign genealogy
Currently held by HECTOR, WILLIAM 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 K6TSZ's current licensee, walking backwards.
- Osbrink, Thomas WCAgranted 2024-02-07cancelled 2025-06-06
Successor callsigns
Callsigns held now by people who previously held K6TSZ.
- Osbrink, Thomas WCAgranted 2026-04-10
All historical holders
Every license row we've seen with the callsign K6TSZ, oldest first.
- HECTOR, WILLIAM J CA2008-06-18 → cancelled 2020-08-25
- Osbrink, Thomas W CA2025-06-06 → cancelled 2026-04-10