Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1SDP callsign genealogy
Currently held by NELSON, ROBERT 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 N1SDP's current licensee, walking backwards.
- Peterson, Scott DORgranted 2012-05-15cancelled 2014-04-18
Successor callsigns
Callsigns held now by people who previously held N1SDP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N1SDP, oldest first.
- NELSON, ROBERT J ME1994-07-07 → cancelled 2006-07-08
- Peterson, Scott D OR2024-08-27 active