Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4CPA callsign genealogy
Currently held by Campbell, Robert M
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 KJ4CPA's current licensee, walking backwards.
- Astorga, Clarence PFLgranted 2020-01-27cancelled 2020-04-04
Successor callsigns
Callsigns held now by people who previously held KJ4CPA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KJ4CPA, oldest first.
- Campbell, Robert M SC2008-03-11 → cancelled 2020-03-12
- Astorga, Clarence P FL2020-04-04 active