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

KO5SA callsign genealogy

Currently held by KOSA, ROBERT A

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 KO5SA's current licensee, walking backwards.

  1. N5LCOcancelled· A
    KOSA, ROBERT ATXgranted 1993-03-02cancelled 2000-02-29
  2. KB5DFY
    no FCC ULS record on file

Successor callsigns

Callsigns held now by people who previously held KO5SA.

  1. KO5Aactive· E
    KOSA, ROBERT ATXgranted 2018-10-27
← Back to KO5SA License history →