Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9SF callsign genealogy
Currently held by GEYER, LELAND 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 KB9SF's current licensee, walking backwards.
- Frank, Steven DILgranted 2017-09-26cancelled 2018-01-20
Successor callsigns
Callsigns held now by people who previously held KB9SF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB9SF, oldest first.
- GEYER, LELAND W IL1993-06-15 → cancelled 2005-06-16
- Frank, Steven D IL2018-01-20 active