Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4OBD callsign genealogy
Currently held by Thompson, Robert T
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 KO4OBD's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KO4OBD.
- Thompson, Robert TNCgranted 2021-04-17cancelled 2022-03-04