Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WF4HAM callsign genealogy
Currently held by Ham, Jon 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 WF4HAM's current licensee, walking backwards.
- Ham, Jon PFLgranted 2007-03-07cancelled 2009-12-01
Successor callsigns
Callsigns held now by people who previously held WF4HAM.
No current licensee on record previously held this callsign.