Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1SDH callsign genealogy
Currently held by Hartman, Steven 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 W1SDH's current licensee, walking backwards.
- Hartman, Steven DMAgranted 2013-08-01cancelled 2015-05-22
Successor callsigns
Callsigns held now by people who previously held W1SDH.
No current licensee on record previously held this callsign.