Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WU4J callsign genealogy
Currently held by King, Christopher 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 WU4J's current licensee, walking backwards.
- King, Christopher MTNgranted 2007-12-05cancelled 2008-04-19
Successor callsigns
Callsigns held now by people who previously held WU4J.
- KELLEY, RALPH DFLgranted 1988-08-02cancelled 2000-08-03
All historical holders
Every license row we've seen with the callsign WU4J, oldest first.
- JACKSON, ED R GA1997-08-21 → cancelled 2002-04-16
- King, Christopher M TN2018-02-13 active