Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1SGT callsign genealogy
Currently held by WHITTEMORE, ROBERT M
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 W1SGT's current licensee, walking backwards.
- Baldwin, Brian DCOgranted 2009-10-30cancelled 2011-06-10
Successor callsigns
Callsigns held now by people who previously held W1SGT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1SGT, oldest first.
- WHITTEMORE, ROBERT M MA1995-02-06 → cancelled 2007-02-07
- Baldwin, Brian D MT2021-06-08 active