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Confidence: Medium · Source: FCC ULS · As of 2026-09-12

KC3OL callsign genealogy

Currently held by HOLDAHL, THEODORE S

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 KC3OL's current licensee, walking backwards.

  1. WF0Nactive· E
    Bishop, Reid JCOgranted 2017-04-14
  2. W9LLactive· E
    OLSON, CRAIG ATXgranted 2019-05-03
  3. KI5AAXcancelled· E
    OLSON, CRAIG ATXgranted 2018-05-29cancelled 2019-05-03

Successor callsigns

Callsigns held now by people who previously held KC3OL.

  1. WF0Ncancelled· E
    HOLDAHL, THEODORE SKSgranted 2011-11-04cancelled 2015-03-24

All historical holders

Every license row we've seen with the callsign KC3OL, oldest first.

  • HOLDAHL, THEODORE S KS
    2010-07-28 → cancelled 2011-11-04
  • HOLDAHL, THEODORE S KS
    2025-01-11 active
← Back to KC3OL License history →