Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4MJM callsign genealogy
Currently held by Marbach, Martin 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 N4MJM's current licensee, walking backwards.
- MARBACH, MARTIN JVAgranted 1998-10-20cancelled 1999-11-27
Successor callsigns
Callsigns held now by people who previously held N4MJM.
No current licensee on record previously held this callsign.