Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9YHF callsign genealogy
Currently held by JOHNSON, SETH D
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 K9YHF's current licensee, walking backwards.
- JOHNSON, SETH DIDgranted 2023-03-29cancelled 2025-08-22
Successor callsigns
Callsigns held now by people who previously held K9YHF.
- Marsh, Thomas RINgranted 2021-03-02
All historical holders
Every license row we've seen with the callsign K9YHF, oldest first.
- LANGS, RICHARD K IL1994-08-22 → cancelled 2006-08-23
- Marsh, Thomas R IN2020-06-26 → cancelled 2021-03-02
- JOHNSON, SETH D ID2025-08-22 active