Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1STX callsign genealogy
Currently held by Upton, Louis R
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 K1STX's current licensee, walking backwards.
- Craig, Jeffrey SMEgranted 2013-04-04cancelled 2017-05-05
Successor callsigns
Callsigns held now by people who previously held K1STX.
- Upton, Louis RTXgranted 2020-06-13
All historical holders
Every license row we've seen with the callsign K1STX, oldest first.
- Upton, Louis R TX2007-10-10 → cancelled 2010-08-06
- Craig, Jeffrey S ME2017-05-05 active