Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5TSU callsign genealogy
Currently held by SHEFFIELD, JAKE
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 K5TSU's current licensee, walking backwards.
- Sheffield, JakeTXgranted 2021-08-20cancelled 2021-09-11
Successor callsigns
Callsigns held now by people who previously held K5TSU.
- K5DDLactiveCROSS TIMBERS AMATEUR RADIO CLUBTXgranted 2017-02-22
All historical holders
Every license row we've seen with the callsign K5TSU, oldest first.
- CROSS TIMBERS AMATEUR RADIO CLUB TX2010-11-10 → cancelled 2017-02-22
- SHEFFIELD, JAKE TX2021-09-11 active