Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4TTX callsign genealogy
Currently held by STARKENBURG, ROBERT J
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 W4TTX's current licensee, walking backwards.
- STARKENBURG, ROBERT JNCgranted 2002-10-10cancelled 2004-12-07
Successor callsigns
Callsigns held now by people who previously held W4TTX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4TTX, oldest first.
- HAM, CHARLES M FL1989-01-10 → cancelled 2001-01-11
- STARKENBURG, ROBERT J NC2024-09-24 active