Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9SBU callsign genealogy
Currently held by Clark Jr, Charles M
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 W9SBU's current licensee, walking backwards.
- Clark Jr, Charles MWIgranted 2004-03-31cancelled 2004-06-16
Successor callsigns
Callsigns held now by people who previously held W9SBU.
- Clark Jr, Charles MLAgranted 2018-11-02