Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KP4JSR callsign genealogy
Currently held by SCHMIDT, JOSE P
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 KP4JSR's current licensee, walking backwards.
- Soto Reveron, JavierPRgranted 2016-02-09cancelled 2016-05-13
Successor callsigns
Callsigns held now by people who previously held KP4JSR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KP4JSR, oldest first.
- SCHMIDT, JOSE P PR2004-04-20 → cancelled 2016-04-21
- Soto Reveron, Javier PR2026-03-25 active