Confidence: Medium · Source: FCC ULS · As of 2026-09-09
K4SDT callsign genealogy
Currently held by Spoone, James H
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 K4SDT's current licensee, walking backwards.
- Jones, John DTNgranted 2021-04-23cancelled 2021-05-18
Successor callsigns
Callsigns held now by people who previously held K4SDT.
- JONES, JOHN DTNgranted 2024-11-13
All historical holders
Every license row we've seen with the callsign K4SDT, oldest first.
- Spoone, James H AL2007-05-30 → cancelled 2019-08-23
- JONES, JOHN D TN2021-05-18 → cancelled 2024-11-13