Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0JMM callsign genealogy
Currently held by Mathison, Merle J
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 K0JMM's current licensee, walking backwards.
- Magyar, JamesKSgranted 2007-06-22cancelled 2011-10-12
Successor callsigns
Callsigns held now by people who previously held K0JMM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0JMM, oldest first.
- Mathison, Merle J ND1998-12-15 → cancelled 2010-12-16
- Magyar, James M KS2022-08-30 active