Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1ITU callsign genealogy
Currently held by ROBERTSON, DONOVAN A
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 W1ITU's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W1ITU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1ITU, oldest first.
- ROBERTSON, DONOVAN A ME1988-07-26 → cancelled 2000-07-27
- Griener 477, John L MA2025-12-09 active