uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

N3SI callsign genealogy

Currently held by POPELLA, 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 N3SI's current licensee, walking backwards.

  1. KA4FCLcancelled· E
    Lambert, Floyd CALgranted 2015-06-02cancelled 2017-03-28
  2. KM4JNFcancelled· T
    Lambert, Floyd CALgranted 2015-04-08cancelled 2015-06-02

Successor callsigns

Callsigns held now by people who previously held N3SI.

  1. N3OOactive· E
    POPELLA, ROBERT MPAgranted 2019-01-02
  2. NA3Dcancelled· E
    DAVIS, FREDERICK WMDgranted 2003-01-28cancelled 2003-05-02

All historical holders

Every license row we've seen with the callsign N3SI, oldest first.

  • DAVIS, FREDERICK W MD
    2002-11-26 → cancelled 2003-01-28
  • DUVAL, MONTAGUE R FL
    2005-03-08 → cancelled 2017-03-09
  • Lambert, Floyd C AL
    2017-03-28 active
  • POPELLA, ROBERT M
    — → cancelled 1999-03-11
← Back to N3SI License history →