Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WM7CH callsign genealogy
Currently held by Mayo Clinic Arizona EMCOMM
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 WM7CH's current licensee, walking backwards.
- KD7ZDNcancelledM. A. R. C.AZgranted 2003-12-23cancelled 2004-02-14
Successor callsigns
Callsigns held now by people who previously held WM7CH.
No current licensee on record previously held this callsign.