Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N1CHS callsign genealogy
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 N1CHS's current licensee, walking backwards.
- KB1NAYcancelledChelmsford High School Amateur Radio ClubMAgranted 2006-01-23cancelled 2009-12-15
Successor callsigns
Callsigns held now by people who previously held N1CHS.
- RUDDY, DANIELMAgranted 1997-10-20cancelled 2009-10-21
All historical holders
Every license row we've seen with the callsign N1CHS, oldest first.
- Chelmsford High School Amateur Radio Club MA2009-12-15 → cancelled 2021-12-16
- —— → cancelled 1997-10-20