Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W8JMG callsign genealogy
Currently held by Grubmuller, John
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 W8JMG's current licensee, walking backwards.
- Grubmuller, JohnOHgranted 2021-08-10cancelled 2021-08-31
Successor callsigns
Callsigns held now by people who previously held W8JMG.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W8JMG, oldest first.
- OWEN, RAYMOND E OH2006-11-29 → cancelled 2019-02-21
- Grubmuller, John OH2021-08-31 active