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

K3STM callsign genealogy

Currently held by WATT, MARTIN 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 K3STM's current licensee, walking backwards.

  1. W8MUactive· E
    Kobish Jr, Donald HMIgranted 2016-12-20
  2. KD8SKOcancelled· E
    Kobish Jr, Donald HMIgranted 2012-05-18cancelled 2016-12-20

Successor callsigns

Callsigns held now by people who previously held K3STM.

  1. W8MUcancelled· E
    WATT, MARTIN DIAgranted 2013-07-06cancelled 2014-11-29
  2. W8MUcancelled· E
    WATT, MARTIN DPAgranted 2011-08-26cancelled 2012-01-31

All historical holders

Every license row we've seen with the callsign K3STM, oldest first.

  • WHARTON, DAVID MD
    1996-11-01 → cancelled 2008-11-04
  • WATT, MARTIN D PA
    2010-09-08 → cancelled 2011-08-26
  • WATT, MARTIN D PA
    2012-01-31 → cancelled 2013-07-06
← Back to K3STM License history →