Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N0JOO callsign genealogy
Currently held by Heppelmann, Don 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 N0JOO's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held N0JOO.
- Heppelmann, Don MMNgranted 2021-02-06