Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1USF callsign genealogy
Currently held by HEETMANN, PAUL 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 W1USF's current licensee, walking backwards.
- DOUGLAS II, RONALD DFLgranted 2006-10-10cancelled 2012-09-25
Successor callsigns
Callsigns held now by people who previously held W1USF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1USF, oldest first.
- HEETMANN, PAUL R CT1998-01-23 → cancelled 2010-01-26
- DOUGLAS II, RONALD D FL2022-09-27 active