Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC4ZJU callsign genealogy
Currently held by THADEN SR, RONALD E
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 KC4ZJU'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 KC4ZJU.
- THADEN SR, RONALD EFLgranted 2009-12-30cancelled 2022-01-22