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

WK9F callsign genealogy

Currently held by SIPP, THURMAN L

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 WK9F's current licensee, walking backwards.

  1. AB9EOcancelled· E
    Chmura, Jerry JILgranted 2003-03-29cancelled 2003-12-12
  2. KB9CSUcancelled· E
    Chmura, Jerry JILgranted 1993-06-08cancelled 2002-04-05

Successor callsigns

Callsigns held now by people who previously held WK9F.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign WK9F, oldest first.

  • SIPP, THURMAN L WI
    1989-09-05 → cancelled 2001-09-06
  • Chmura, Jerry J IL
    2023-11-22 active
← Back to WK9F License history →