Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AB3TW callsign genealogy
Currently held by HEIL, DAVID M
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 AB3TW's current licensee, walking backwards.
- HEIL, DAVID MMDgranted 2012-04-27cancelled 2014-03-03
Successor callsigns
Callsigns held now by people who previously held AB3TW.
No current licensee on record previously held this callsign.