Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1JRG callsign genealogy
Currently held by Guimaraes, Jeffrey R
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 K1JRG's current licensee, walking backwards.
- Guimaraes, JeffreyPAgranted 2019-08-07cancelled 2021-07-27
Successor callsigns
Callsigns held now by people who previously held K1JRG.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1JRG, oldest first.
- JASIENOWSKI, ROGER E NH1994-10-27 → cancelled 2006-10-28
- Guimaraes, Jeffrey R PA2021-07-27 active