Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9JSK callsign genealogy
Currently held by WURTZ, JOSEPH P
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 K9JSK's current licensee, walking backwards.
- Knudson, Joy SWIgranted 2009-03-26cancelled 2009-04-21
Successor callsigns
Callsigns held now by people who previously held K9JSK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9JSK, oldest first.
- WURTZ, JOSEPH P IN1996-06-07 → cancelled 2008-06-10
- Knudson, Joy S WI2019-02-13 active