Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6JSX callsign genealogy
Currently held by MARK, RUSSEL 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 K6JSX's current licensee, walking backwards.
- Sawyer, JonathanMIgranted 2018-10-23cancelled 2018-11-10
Successor callsigns
Callsigns held now by people who previously held K6JSX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6JSX, oldest first.
- MARK, RUSSEL L CA1999-02-11 → cancelled 2011-02-12
- Sawyer, Jonathan MI2018-11-10 active