Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WK1U callsign genealogy
Currently held by Frederick, Tyler J
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 WK1U's current licensee, walking backwards.
- Frederick, Tyler JFLgranted 2015-08-14cancelled 2015-10-06
Successor callsigns
Callsigns held now by people who previously held WK1U.
- SAWTELLE JR, RAYMOND FTXgranted 2013-09-17cancelled 2015-04-21
All historical holders
Every license row we've seen with the callsign WK1U, oldest first.
- ROMAN, GEORGE E CT2000-10-28 → cancelled 2012-10-30
- SAWTELLE JR, RAYMOND F TX2012-12-15 → cancelled 2013-09-17
- Frederick, Tyler J FL2025-11-25 active