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

AF7ZH callsign genealogy

Currently held by Helm, Thomas 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 AF7ZH's current licensee, walking backwards.

  1. KG7UMEcancelled· E
    Helm, Thomas CWAgranted 2015-01-26cancelled 2016-06-01
  2. KG7QLLcancelled· G
    Helm, Thomas CWAgranted 2015-01-26cancelled 2015-06-16

Successor callsigns

Callsigns held now by people who previously held AF7ZH.

  1. WT7Sactive· E
    Helm, Thomas CWAgranted 2017-04-18
← Back to AF7ZH License history →