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

W7WO callsign genealogy

Currently held by Kalkwarf, Robert L

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 W7WO's current licensee, walking backwards.

  1. KB1VYLcancelled· E
    JERVIS, ELLENWAgranted 2011-07-22cancelled 2018-04-20

Successor callsigns

Callsigns held now by people who previously held W7WO.

  1. K7AUactive· E
    Kalkwarf, Robert LWAgranted 2026-01-27

All historical holders

Every license row we've seen with the callsign W7WO, oldest first.

  • HYATT, EUGENE M OR
    1996-11-04 → cancelled 2001-01-01
  • BRONZE MOUNTAIN DX CLUB AZ
    2003-01-28 → cancelled 2004-05-04
  • Kalkwarf, Robert L WA
    2016-03-19 → cancelled 2016-04-01
  • JERVIS, ELLEN WA
    2018-04-20 active
← Back to W7WO License history →