Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1SFD callsign genealogy
Currently held by Patterson, Michael J
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 N1SFD's current licensee, walking backwards.
- Patterson, Michael JMAgranted 2022-12-14cancelled 2023-06-22
Successor callsigns
Callsigns held now by people who previously held N1SFD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N1SFD, oldest first.
- WEST, GERALD B MA2004-04-19 → cancelled 2016-07-09
- Patterson, Michael J MA2023-06-22 active