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

W4FI callsign genealogy

Currently held by RITTER, FREDERICK O

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 W4FI's current licensee, walking backwards.

  1. N2CJactive· E
    MULLER, GLENN MNJgranted 2019-12-24
  2. KB2FMcancelled· E
    MULLER, GLENN MNJgranted 2002-11-02cancelled 2010-02-19
  3. N2DUBactive· T
    Peterson, Tanner ATXgranted 2025-12-18
  4. KG5LHIcancelled· T
    Peterson, Tanner ATXgranted 2016-02-01cancelled 2016-02-20

Successor callsigns

Callsigns held now by people who previously held W4FI.

  1. W5QQcancelled· E
    PARTRIDGE, DELMAR ETXgranted 2015-12-23cancelled 2019-09-19

All historical holders

Every license row we've seen with the callsign W4FI, oldest first.

  • RITTER, FREDERICK O FL
    1996-04-04 → cancelled 2002-08-19
  • PARTRIDGE, DELMAR E TX
    2004-09-08 → cancelled 2006-01-10
  • STAMPF, CHARLES E FL
    2017-12-08 active
← Back to W4FI License history →