Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4RTX callsign genealogy
Currently held by Winkler, Lionel 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 KB4RTX's current licensee, walking backwards.
- Winkler, Lionel WSCgranted 2009-10-30cancelled 2010-03-23
Successor callsigns
Callsigns held now by people who previously held KB4RTX.
No current licensee on record previously held this callsign.