Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KT5DX callsign genealogy
Currently held by JP AMATEUR RADIO CLUB
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 KT5DX's current licensee, walking backwards.
- Oltmann, Derrick RTXgranted 2020-11-16cancelled 2021-05-25
Successor callsigns
Callsigns held now by people who previously held KT5DX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KT5DX, oldest first.
- JP AMATEUR RADIO CLUB TX2010-03-27 → cancelled 2021-04-29
- Oltmann, Derrick R TX2021-05-25 active