Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4TBS callsign genealogy
Currently held by Sisson, Timothy B
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 KO4TBS's current licensee, walking backwards.
- SISSON, TIMOTHY BGAgranted 2020-01-21cancelled 2020-02-08
Successor callsigns
Callsigns held now by people who previously held KO4TBS.
No current licensee on record previously held this callsign.