Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KT0S callsign genealogy
Currently held by FREDERICK, ORVILLE 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 KT0S's current licensee, walking backwards.
- SAUER, KEVIN TMNgranted 2008-11-04cancelled 2009-03-31
Successor callsigns
Callsigns held now by people who previously held KT0S.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KT0S, oldest first.
- FREDERICK, ORVILLE D CO1998-04-23 → cancelled 2009-02-12
- SAUER, KEVIN T MN2019-02-01 active