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

WB4HDW callsign genealogy

Currently held by Schmitt, Roger Y

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 WB4HDW's current licensee, walking backwards.

  1. KG4MJFactive· T
    FENLON, MICHAEL JTNgranted 2021-07-20
  2. KO4RQJcancelled· T
    FENLON, MICHAEL JTNgranted 2021-07-01cancelled 2021-07-20

Successor callsigns

Callsigns held now by people who previously held WB4HDW.

  1. KY4RSactive· E
    Schmitt, Roger YKYgranted 2019-05-23
← Back to WB4HDW License history →