Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9JRM callsign genealogy
Currently held by Matthes, Rene
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 K9JRM's current licensee, walking backwards.
- MCWILLIAMS, JOHN RWIgranted 2024-01-26cancelled 2024-04-16
Successor callsigns
Callsigns held now by people who previously held K9JRM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9JRM, oldest first.
- Matthes, Rene FL2008-07-25 → cancelled 2020-07-28
- MCWILLIAMS, JOHN R WI2024-04-16 active