Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9SX callsign genealogy
Currently held by LASEK, THOMAS 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 W9SX's current licensee, walking backwards.
- Oaks, Larence KINgranted 2007-01-03cancelled 2011-11-04
Successor callsigns
Callsigns held now by people who previously held W9SX.
- CLARK, JOE FTNgranted 2019-05-03
All historical holders
Every license row we've seen with the callsign W9SX, oldest first.
- LASEK, THOMAS E IL2001-07-06 → cancelled 2009-10-16
- Oaks, Larence K FL2021-08-11 active
- —— → cancelled 1999-06-16