Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9MMH callsign genealogy
Currently held by Onsager, Ralph 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 KB9MMH'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 KB9MMH.
- Onsager, Ralph WWIgranted 2005-11-09cancelled 2018-01-20