Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA7COS callsign genealogy
Currently held by DEUEL, ROBERT T
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 KA7COS's current licensee, walking backwards.
- Cosgrove, Caroline KWAgranted 2020-08-10cancelled 2020-08-28
Successor callsigns
Callsigns held now by people who previously held KA7COS.
- DEUEL, ROBERT TORgranted 2019-12-27
All historical holders
Every license row we've seen with the callsign KA7COS, oldest first.
- DEUEL, ROBERT T OR1997-04-30 → cancelled 2000-02-05
- Cosgrove, Caroline K CO2020-08-28 active