Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KT3J callsign genealogy
Currently held by HEEMSTRA, FRANK W
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 KT3J's current licensee, walking backwards.
- Tanaka, KazuyoshiKYgranted 2008-07-25cancelled 2009-08-18
Successor callsigns
Callsigns held now by people who previously held KT3J.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KT3J, oldest first.
- HEEMSTRA, FRANK W SD1998-06-08 → cancelled 2006-05-25
- Tanaka, Kazuyoshi KY2019-05-24 active