Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W7OSX callsign genealogy
Currently held by Mauch, Charles
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 W7OSX's current licensee, walking backwards.
- Mauch, CharlesWAgranted 2021-02-18cancelled 2021-04-02
Successor callsigns
Callsigns held now by people who previously held W7OSX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W7OSX, oldest first.
- MORRIS, DONALD A WA1998-01-14 → cancelled 1999-07-14
- Mauch, Charles WA2021-04-02 active