Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KB7SJT callsign genealogy
Currently held by TREWARTHA, DONALD F
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 KB7SJT's current licensee, walking backwards.
- Campbell, Amy BTXgranted 2022-04-11cancelled 2022-04-30
Successor callsigns
Callsigns held now by people who previously held KB7SJT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB7SJT, oldest first.
- TREWARTHA, DONALD F AZ1993-02-02 → cancelled 2005-02-03
- Campbell, Amy B TX2022-04-30 active