Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4JAT callsign genealogy
Currently held by TRENAMAN MR, DOUGLAS B
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 W4JAT's current licensee, walking backwards.
- TRENAMAN, DOUGLAS BOHgranted 2007-02-03cancelled 2007-02-09
Successor callsigns
Callsigns held now by people who previously held W4JAT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4JAT, oldest first.
- Trenaman, John I FL2003-10-03 → cancelled 2006-08-03
- TRENAMAN MR, DOUGLAS B OH2016-12-01 active