Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KT1A callsign genealogy
Currently held by GRIBBEL III, JOHN
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 KT1A's current licensee, walking backwards.
- Sherman, Greg RWAgranted 2022-12-24cancelled 2023-10-20
Successor callsigns
Callsigns held now by people who previously held KT1A.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KT1A, oldest first.
- GRIBBEL III, JOHN NH2011-07-29 → cancelled 2023-10-03
- Sherman, Greg R WA2023-10-20 active