uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-14

W3SR callsign genealogy

Currently held by THYBERG, ROBERT C

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 W3SR's current licensee, walking backwards.

  1. W4QPactive· E
    Crepeau, Andrew DALgranted 2026-02-12
  2. KW4RWcancelled· E
    Crepeau, Andrew DALgranted 2011-12-23cancelled 2016-04-30
  3. KG4RWDcancelled· E
    Crepeau, Andrew DALgranted 2011-12-23cancelled 2016-03-14

Successor callsigns

Callsigns held now by people who previously held W3SR.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign W3SR, oldest first.

  • THYBERG, ROBERT C MD
    2008-02-29 → cancelled 2009-11-26
  • REDLINGER, MARK J VA
    2021-09-20 active
← Back to W3SR License history →