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

W3THM callsign genealogy

Currently held by SIRKIS, DAVID

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 W3THM's current licensee, walking backwards.

  1. K3VFWcancelled· G
    ROBINSON, C THOMASPAgranted 2011-10-21cancelled 2016-12-24
  2. W3KWTactive· G
    ROBINSON Jr, C THOMASPAgranted 2020-10-31

Successor callsigns

Callsigns held now by people who previously held W3THM.

  1. W3KWTactive· G
    ROBINSON Jr, C THOMASPAgranted 2020-10-31

All historical holders

Every license row we've seen with the callsign W3THM, oldest first.

  • SIRKIS, DAVID MD
    1997-10-24 → cancelled 2009-10-27
  • ROBINSON, C THOMAS PA
    2016-12-24 → cancelled 2020-10-31
← Back to W3THM License history →