Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KJ4OIO callsign genealogy
Currently held by DAVEY IV, ROBERT 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 KJ4OIO'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 KJ4OIO.
- DAVEY IV, ROBERT JSCgranted 2014-03-11cancelled 2026-03-12