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

W3OS callsign genealogy

Currently held by SMITH, DONALD E

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 W3OS's current licensee, walking backwards.

  1. K3WJCcancelled· E
    Collins, William JMDgranted 2014-07-12cancelled 2022-07-09
  2. KC3CMWcancelled· T
    Collins, William JMDgranted 2014-04-07cancelled 2014-07-12

Successor callsigns

Callsigns held now by people who previously held W3OS.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign W3OS, oldest first.

  • SMITH, DONALD E PA
    1987-09-22 → cancelled 1999-09-23
  • Felix, James P CA
    2010-04-14 → cancelled 2022-06-07
  • Collins, William J MD
    2022-07-09 active
← Back to W3OS License history →