uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

K3ZF callsign genealogy

Currently held by Robosson, William D

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 K3ZF's current licensee, walking backwards.

  1. KG5FANcancelled· E
    Gray, Thomas HTXgranted 2014-12-04cancelled 2015-01-23

Successor callsigns

Callsigns held now by people who previously held K3ZF.

  1. AA5TGactive· E
    Gray, Thomas HLAgranted 2025-09-09
  2. N1RMcancelled· E
    MOORE SR, ROBERT MFLgranted 2004-08-17cancelled 2012-08-07

All historical holders

Every license row we've seen with the callsign K3ZF, oldest first.

  • MOORE SR, ROBERT M GA
    2003-11-08 → cancelled 2004-08-17
  • Robosson, William D PA
    2006-12-27 → cancelled 2013-01-02
  • Gray, Thomas H LA
    2024-12-27 → cancelled 2025-09-09
← Back to K3ZF License history →