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

KB0SG callsign genealogy

Currently held by MARTIN, WILLIAM H

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 KB0SG's current licensee, walking backwards.

  1. KV4SGcancelled· A
    MARTIN, WILLIAM HGAgranted 2000-08-22cancelled 2001-05-25
  2. KK3SGcancelled· A
    MARTIN, WILLIAM HGAgranted 2000-07-22cancelled 2000-08-22
  3. K4SGFexpired· G
    FRIEDMAN, SAMUEL GGAgranted 2013-03-12cancelled 2025-03-13
  4. KK4MAGcancelled· T
    Friedman, Samuel GGAgranted 2012-10-12cancelled 2013-03-12

Successor callsigns

Callsigns held now by people who previously held KB0SG.

  1. K4SGFcancelled· A
    MARTIN, WILLIAM HGAgranted 2001-09-11cancelled 2002-04-16
← Back to KB0SG License history →