Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1SWM callsign genealogy
Currently held by Peterson, Donald D
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 W1SWM's current licensee, walking backwards.
- Peterson, Donald DNYgranted 2003-08-07cancelled 2007-01-04
Successor callsigns
Callsigns held now by people who previously held W1SWM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1SWM, oldest first.
- PETERSON, HARRY W CT1995-05-03 → cancelled 2005-06-08
- Peterson, Donald D NY2016-10-31 active