Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4CBA callsign genealogy
Currently held by Frailing, Robert 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 KJ4CBA's current licensee, walking backwards.
- Astorga, Mary CFLgranted 2021-06-04cancelled 2021-07-20
Successor callsigns
Callsigns held now by people who previously held KJ4CBA.
- Frailing, Robert STNgranted 2017-12-01
All historical holders
Every license row we've seen with the callsign KJ4CBA, oldest first.
- Frailing, Robert S FL2008-02-19 → cancelled 2009-08-11
- Astorga, Mary C FL2021-07-20 active