Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4TJH callsign genealogy
Currently held by Heineken, Timothy
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 W4TJH's current licensee, walking backwards.
- Heineken, Timothy JALgranted 2017-10-10cancelled 2017-10-31
Successor callsigns
Callsigns held now by people who previously held W4TJH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4TJH, oldest first.
- CLARK, LOUIS S FL2004-10-13 → cancelled 2016-07-16
- Heineken, Timothy OK2017-10-31 active