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

KB1CTM callsign genealogy

Currently held by HEAVNER, MICHAEL W

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 KB1CTM's current licensee, walking backwards.

  1. N4SRVactive· E
    READINGER SR, DONALD JSCgranted 2023-08-30
  2. KI4CZScancelled· E
    READINGER SR, DONALD JSCgranted 2013-02-05cancelled 2013-03-09
  3. KD6ONScancelled· T
    READINGER SR, DONALD JSCgranted 2002-09-28cancelled 2003-11-20

Successor callsigns

Callsigns held now by people who previously held KB1CTM.

  1. KA5RNLexpired· G
    HEAVNER, MICHAEL WMDgranted 2013-05-17cancelled 2025-05-20
← Back to KB1CTM License history →