Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1TKO callsign genealogy
Currently held by Swatko, Michael
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 W1TKO's current licensee, walking backwards.
- Swatko, MichaelNHgranted 2022-02-23cancelled 2022-04-01
Successor callsigns
Callsigns held now by people who previously held W1TKO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1TKO, oldest first.
- OLSSON, THOMAS K RI2007-10-19 → cancelled 2019-11-20
- Swatko, Michael NH2022-04-01 active