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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

K4CJ callsign genealogy

Currently held by CRACKER JACK CONTESTERS

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 K4CJ's current licensee, walking backwards.

  1. AG4IScancelled· E
    Sturrock, John DFLgranted 2000-11-10cancelled 2001-10-12
  2. KG4LQUcancelled· E
    Sturrock, John DFLgranted 2000-11-10cancelled 2001-05-10
  3. KG4KJKcancelled· G
    Sturrock, John DFLgranted 2000-11-10cancelled 2001-02-09

Successor callsigns

Callsigns held now by people who previously held K4CJ.

  1. KR6RFcancelled
    CRACKER JACK CONTESTERSCAgranted 1999-09-22cancelled 2003-04-18

All historical holders

Every license row we've seen with the callsign K4CJ, oldest first.

  • CRACKER JACK CONTESTERS CA
    1999-04-08 → cancelled 1999-09-22
  • Sturrock, John D FL
    2021-08-16 active
← Back to K4CJ License history →