Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5BTZ callsign genealogy
Currently held by SCHELPER, MAX 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 K5BTZ's current licensee, walking backwards.
- Harris, Mark WTXgranted 2022-07-20cancelled 2022-09-30
Successor callsigns
Callsigns held now by people who previously held K5BTZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K5BTZ, oldest first.
- SCHELPER, MAX W TX1995-12-01 → cancelled 2007-12-04
- Harris, Mark W TX2022-09-30 active