Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB9ER callsign genealogy
Currently held by Koch, Richard A
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 AB9ER's current licensee, walking backwards.
- Koch, Richard AWIgranted 2012-08-01cancelled 2024-12-03
Successor callsigns
Callsigns held now by people who previously held AB9ER.
- Koch, Richard AWIgranted 2012-08-01cancelled 2024-12-03