Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4TDO callsign genealogy
Currently held by OSBORNE, TIMOTHY D
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 K4TDO's current licensee, walking backwards.
- OSBORNE, TIMOTHY DKYgranted 1996-04-03cancelled 2000-08-01
Successor callsigns
Callsigns held now by people who previously held K4TDO.
No current licensee on record previously held this callsign.