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

WC9D callsign genealogy

Currently held by Dwyer, Harold R

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 WC9D's current licensee, walking backwards.

  1. KB4GEYcancelled· E
    WHALEN, EDWARD RVAgranted 2012-01-24cancelled 2018-11-06

Successor callsigns

Callsigns held now by people who previously held WC9D.

  1. W4HRDactive· E
    Dwyer, Harold RFLgranted 2023-03-13
  2. K9WTHcancelled· E
    BUCHANAN, MARK AINgranted 2016-10-18cancelled 2017-07-04
  3. K9WTHcancelled· E
    BUCHANAN, MARK AINgranted 2015-08-07cancelled 2016-05-28

All historical holders

Every license row we've seen with the callsign WC9D, oldest first.

  • JOHNSEN JR, HARRY R IL
    1998-07-22 → cancelled 2010-07-23
  • Dwyer, Harold R FL
    2010-10-15 → cancelled 2013-05-14
  • BUCHANAN, MARK A IN
    2015-06-06 → cancelled 2015-08-07
  • BUCHANAN, MARK A IN
    2016-05-28 → cancelled 2016-10-18
  • WHALEN, EDWARD R VA
    2018-11-06 active
← Back to WC9D License history →