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

KV4SG 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 KV4SG's current licensee, walking backwards.

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

Successor callsigns

Callsigns held now by people who previously held KV4SG.

  1. KB0SGcancelled· A
    MARTIN, WILLIAM HGAgranted 2001-05-25cancelled 2001-09-11
← Back to KV4SG License history →