Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM4UPA callsign genealogy
Currently held by DONOHUE, WILLIAM P
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 KM4UPA's current licensee, walking backwards.
- DONOHUE, WILLIAM PTNgranted 2014-08-26cancelled 2016-06-14
Successor callsigns
Callsigns held now by people who previously held KM4UPA.
- DONOHUE, WILLIAM PTNgranted 2018-05-22