Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4PQK callsign genealogy
Currently held by Williamson, Ralph J
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 KJ4PQK's current licensee, walking backwards.
- Williamson, Ralph JFLgranted 2009-04-09cancelled 2009-10-09
Successor callsigns
Callsigns held now by people who previously held KJ4PQK.
- WILLIAMSON, RALPH JFLgranted 2013-02-05cancelled 2025-02-06