Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KB1RJS callsign genealogy
Currently held by BORAWSKI, ADAM S
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 KB1RJS's current licensee, walking backwards.
- Sisca, Richard JCTgranted 2021-10-26cancelled 2022-08-16
Successor callsigns
Callsigns held now by people who previously held KB1RJS.
- BORAWSKI, ADAM SCTgranted 2018-10-15
All historical holders
Every license row we've seen with the callsign KB1RJS, oldest first.
- BORAWSKI, ADAM S CT2008-11-12 → cancelled 2009-01-06
- Sisca, Richard J CT2022-08-16 active