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

WT7S 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 WT7S's current licensee, walking backwards.

  1. AF7ZHcancelled· E
    Helm, Thomas CWAgranted 2015-01-26cancelled 2017-04-18
  2. KG7UMEcancelled· E
    Helm, Thomas CWAgranted 2015-01-26cancelled 2016-06-01
  3. KG7QLLcancelled· G
    Helm, Thomas CWAgranted 2015-01-26cancelled 2015-06-16

Successor callsigns

Callsigns held now by people who previously held WT7S.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign WT7S, oldest first.

  • SUMMERS, MARVIN K OR
    2005-01-05 → cancelled 2017-03-31
  • Helm, Thomas C WA
    2017-04-18 active
← Back to WT7S License history →