Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC9TBM callsign genealogy
Currently held by Heitl, William L
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 KC9TBM's current licensee, walking backwards.
- Heitl, William LWIgranted 2009-09-10cancelled 2010-09-08
Successor callsigns
Callsigns held now by people who previously held KC9TBM.
- Heitl, William LWIgranted 2016-11-15