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

AC9KJ callsign genealogy

Currently held by Boisen, Robert

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 AC9KJ's current licensee, walking backwards.

  1. KD9CSJcancelled· E
    Boisen, RobertWIgranted 2014-11-18cancelled 2015-01-09
  2. KD9CNPcancelled· G
    Boisen, RobertWIgranted 2014-11-18cancelled 2014-12-16

Successor callsigns

Callsigns held now by people who previously held AC9KJ.

  1. AI8Nactive· E
    Boisen, RobertWIgranted 2017-04-11
← Back to AC9KJ License history →