Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9KMA callsign genealogy
Currently held by KOOPMAN, JON S
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 W9KMA's current licensee, walking backwards.
- KOOPMAN, JON SIDgranted 2005-05-02cancelled 2009-09-12
Successor callsigns
Callsigns held now by people who previously held W9KMA.
No current licensee on record previously held this callsign.