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

KL9ER callsign genealogy

Currently held by Osterhoudt, 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 KL9ER's current licensee, walking backwards.

  1. AL5Pactive· E
    JOHNSON, DAVID CTXgranted 2020-05-23
  2. KB5YLGcancelled· E
    JOHNSON, DAVID CAKgranted 2014-01-16cancelled 2020-05-23

Successor callsigns

Callsigns held now by people who previously held KL9ER.

  1. KL9Ractive· E
    Osterhoudt, RobertNYgranted 2026-05-09
← Back to KL9ER License history →