Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N0JMA callsign genealogy
Currently held by Ambrose, John M
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 N0JMA's current licensee, walking backwards.
- Ambrose, John MMIgranted 2023-09-30cancelled 2023-10-24
Successor callsigns
Callsigns held now by people who previously held N0JMA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N0JMA, oldest first.
- KOPPY, STEVE ND2008-07-31 → cancelled 2020-08-13
- Ambrose, John M MI2023-10-24 active