Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1EOI callsign genealogy
Currently held by Upham, Donald B
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 W1EOI's current licensee, walking backwards.
- Upham, Donald BSCgranted 2002-03-21cancelled 2002-05-31
Successor callsigns
Callsigns held now by people who previously held W1EOI.
No current licensee on record previously held this callsign.