Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4KTX callsign genealogy
Currently held by Christiansen, James M
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 W4KTX's current licensee, walking backwards.
- GRAVES III, HOWARD CALgranted 2014-10-03cancelled 2015-02-03
Successor callsigns
Callsigns held now by people who previously held W4KTX.
- Christiansen, James MFLgranted 2007-02-16cancelled 2007-06-01
All historical holders
Every license row we've seen with the callsign W4KTX, oldest first.
- Christiansen, James M FL2003-11-25 → cancelled 2007-02-16
- Graves III, Howard C AL2025-01-23 active