Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3MHZ callsign genealogy
Currently held by Richter, William R
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 K3MHZ's current licensee, walking backwards.
- Anderson, Paul CAZgranted 2020-01-13cancelled 2020-02-04
Successor callsigns
Callsigns held now by people who previously held K3MHZ.
- Richter, William RCAgranted 2017-12-05
All historical holders
Every license row we've seen with the callsign K3MHZ, oldest first.
- CLARK, WILLIAM K MD2009-04-08 → cancelled 2015-08-18
- Richter, William R CA2017-09-08 → cancelled 2017-12-05
- Anderson, Paul AZ2020-02-04 active