Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4JJV callsign genealogy
Currently held by THOMPSON, WILLIAM R
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 K4JJV's current licensee, walking backwards.
- Vandenburg Jr, James JGAgranted 2012-03-28cancelled 2012-08-14
Successor callsigns
Callsigns held now by people who previously held K4JJV.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4JJV, oldest first.
- THOMPSON, WILLIAM R AL1998-02-20 → cancelled 2010-02-23
- Vandenburg Jr, James J GA2022-06-29 active