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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

W9JSB callsign genealogy

Currently held by BLAIR, JEFFREY S

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 W9JSB's current licensee, walking backwards.

  1. KC4JXScancelled· T
    BLAIR, JEFFREY SWIgranted 2009-02-20cancelled 2010-02-19

Successor callsigns

Callsigns held now by people who previously held W9JSB.

  1. W9SXcancelled· E
    LASEK, THOMAS EILgranted 2001-07-06cancelled 2009-10-16

All historical holders

Every license row we've seen with the callsign W9JSB, oldest first.

  • LASEK, THOMAS E IL
    1999-05-13 → cancelled 2001-07-06
  • BLAIR, JEFFREY S MI
    2019-12-28 active
← Back to W9JSB License history →