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

K4SHF callsign genealogy

Currently held by Tapio, Timothy M

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 K4SHF's current licensee, walking backwards.

  1. AG4QEcancelled· E
    Tapio, Timothy MNCgranted 1997-12-29cancelled 2004-03-23
  2. N7BFGactive· E
    Sypolt, Jack DNVgranted 2021-03-29
  3. KF7PHYcancelled· G
    Sypolt, Jack DNVgranted 2011-04-25cancelled 2011-05-17

Successor callsigns

Callsigns held now by people who previously held K4SHF.

No current licensee on record previously held this callsign.

← Back to K4SHF License history →