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

W9CDY callsign genealogy

Currently held by Erickson, Michael K

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 W9CDY's current licensee, walking backwards.

  1. W1WHNcancelled· T
    Erickson, Michael KNCgranted 2015-03-17cancelled 2015-07-07
  2. WB1ARTactive· G
    Smolowitz, ArthurFLgranted 2021-05-22
  3. WA4ABDcancelled· G
    Smolowitz, ArthurFLgranted 2021-03-02cancelled 2021-05-22
  4. KO4LURcancelled· G
    Smolowitz, ArthurFLgranted 2021-02-01cancelled 2021-03-02

Successor callsigns

Callsigns held now by people who previously held W9CDY.

  1. W9BZXcancelled· T
    Erickson, Michael KMIgranted 2021-01-29cancelled 2025-01-14
← Back to W9CDY License history →