Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1WJM callsign genealogy
Currently held by KEMPH III, JOSEPH X
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 W1WJM's current licensee, walking backwards.
- Mumley, Warren JCTgranted 2019-02-20cancelled 2019-05-21
Successor callsigns
Callsigns held now by people who previously held W1WJM.
- KEMPH III, JOSEPH XPAgranted 2017-11-02
All historical holders
Every license row we've seen with the callsign W1WJM, oldest first.
- KEMPH III, JOSEPH X PA2007-11-10 → cancelled 2016-10-27
- Mumley, Warren J CT2019-05-21 active