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

K4JTM callsign genealogy

Currently held by McMahan, John T

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 K4JTM's current licensee, walking backwards.

  1. WU6Cactive· E
    Sakaguchi, HiroshiCAgranted 2023-10-03
  2. KN6HNBcancelled· E
    Sakaguchi, HiroshiCAgranted 2020-02-10cancelled 2023-10-03

Successor callsigns

Callsigns held now by people who previously held K4JTM.

  1. WU6Ccancelled· E
    McMahan, John TTNgranted 2020-12-29cancelled 2021-05-15

All historical holders

Every license row we've seen with the callsign K4JTM, oldest first.

  • RICHARD, MILDRED J FL
    2005-12-28 → cancelled 2018-03-06
  • McMahan, John T TN
    2018-07-20 → cancelled 2020-12-29
  • McMahan, John T TN
    2021-05-15 active
← Back to K4JTM License history →