Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4PDO callsign genealogy
Currently held by THRONEBERRY, GRADY L
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 KB4PDO's current licensee, walking backwards.
- WILLIAMS, JOHN AARgranted 2021-06-18
Successor callsigns
Callsigns held now by people who previously held KB4PDO.
No current licensee on record previously held this callsign.