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

K9PQ callsign genealogy

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 K9PQ's current licensee, walking backwards.

  1. AC7NFcancelled· E
    HELLING, ROBERT BWAgranted 2001-05-03cancelled 2005-03-25
  2. KF9ALcancelled· E
    HELLING, ROBERT BWAgranted 1991-05-14cancelled 2001-05-03
  3. KA7ZSN
    no FCC ULS record on file

Successor callsigns

Callsigns held now by people who previously held K9PQ.

  1. WD9ONexpired· E
    RIVERA JR, DOMINGO MWIgranted 2013-01-18cancelled 2025-02-12
  2. AF9FAcancelled· E
    RIVERA JR, DOMINGO MWIgranted 1998-11-24cancelled 2002-07-09

All historical holders

Every license row we've seen with the callsign K9PQ, oldest first.

  • RIVERA JR, DOMINGO M WI
    2002-07-09 → cancelled 2003-02-11
  • HELLING, ROBERT B WA
    2025-04-08 active
  • —
    — → cancelled 1998-11-24
← Back to K9PQ License history →