Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4MTM callsign genealogy
Currently held by CRISP, RUDOLF W
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 KJ4MTM'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 KJ4MTM.
- Crisp, Rudolf WVAgranted 2009-12-01cancelled 2015-12-15