Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC3M callsign genealogy
Currently held by METZGER, FREDERICK 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 AC3M's current licensee, walking backwards.
- McKinney, Carlos EMDgranted 2006-01-31cancelled 2012-10-19
Successor callsigns
Callsigns held now by people who previously held AC3M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC3M, oldest first.
- METZGER, FREDERICK J PA2008-05-02 → cancelled 2010-09-30
- McKinney, Carlos E MD2022-10-04 active