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

N5OSU callsign genealogy

Currently held by Schmahl, Curt

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 N5OSU's current licensee, walking backwards.

  1. KF5DDEcancelled· T
    SCHMAHL, CURTISS ROKgranted 2003-06-25cancelled 2013-01-29
  2. K0DENactive· E
    Athing, WilliamALgranted 2023-04-11
  3. KO4OPZcancelled· E
    Athing, WilliamALgranted 2021-03-23cancelled 2023-04-11

Successor callsigns

Callsigns held now by people who previously held N5OSU.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign N5OSU, oldest first.

  • GRIMES, PAT E NM
    1999-10-13 → cancelled 2011-10-14
  • Schmahl, Curt OK
    2023-02-22 active
← Back to N5OSU License history →