Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4MTT callsign genealogy
Currently held by Murray, William 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 K4MTT's current licensee, walking backwards.
- HENDRICKS, KATHLEEN MNCgranted 2011-08-23cancelled 2015-12-01
- KO4JRno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held K4MTT.
- Murray, William RTNgranted 2005-06-24cancelled 2007-04-17
All historical holders
Every license row we've seen with the callsign K4MTT, oldest first.
- Murray, William R TN2005-04-12 → cancelled 2005-06-24
- HENDRICKS, KATHLEEN M NC2025-12-09 active