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

KJ1O callsign genealogy

Currently held by Oh, Jin

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 KJ1O's current licensee, walking backwards.

  1. K1JLOcancelled· E
    Oh, JinOHgranted 2025-06-24cancelled 2026-07-21
  2. AD8PHcancelled· E
    Oh, JinOHgranted 2025-05-16cancelled 2025-06-24

Successor callsigns

Callsigns held now by people who previously held KJ1O.

  1. KC7GWTactive· E
    Burt, Christopher SVAgranted 2024-06-29

All historical holders

Every license row we've seen with the callsign KJ1O, oldest first.

  • BROOK, RICHARD J SC
    2011-10-15 → cancelled 2023-12-12
  • Burt, Christopher S VA
    2024-01-27 → cancelled 2024-06-29
  • Oh, Jin OH
    2026-07-21 active
← Back to KJ1O License history →