Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA3SO callsign genealogy
Currently held by COHEN, ROBERT D
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 AA3SO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AA3SO.
- COHEN, ROBERT DPAgranted 2007-11-16cancelled 2011-03-05
All historical holders
Every license row we've seen with the callsign AA3SO, oldest first.
- COHEN, ROBERT D PA2007-03-06 → cancelled 2007-11-16
- COHEN, ROBERT D PA2021-03-05 active