Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K6RJA callsign genealogy
Currently held by Amstadt, Robert J
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 K6RJA's current licensee, walking backwards.
- Alvarez, RandyCAgranted 2016-05-03cancelled 2016-05-24
Successor callsigns
Callsigns held now by people who previously held K6RJA.
- AMSTADT, ROBERT JCAgranted 2010-01-12cancelled 2016-04-22
All historical holders
Every license row we've seen with the callsign K6RJA, oldest first.
- Amstadt, Robert J CA2010-01-12 → cancelled 2014-04-14
- ALVAREZ, RANDY CA2026-03-14 active