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Confidence: Medium · Source: FCC ULS · As of 2026-09-12

K4SGF callsign genealogy

Currently held by FRIEDMAN, SAMUEL G

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 K4SGF's current licensee, walking backwards.

  1. KK4MAGcancelled· T
    Friedman, Samuel GGAgranted 2012-10-12cancelled 2013-03-12

Successor callsigns

Callsigns held now by people who previously held K4SGF.

  1. WM4SGexpired· A
    MARTIN, WILLIAM HGAgranted 2012-01-31cancelled 2024-04-17
  2. KK3SGcancelled· A
    MARTIN, WILLIAM HGAgranted 2000-07-22cancelled 2000-08-22

All historical holders

Every license row we've seen with the callsign K4SGF, oldest first.

  • MARTIN, WILLIAM H GA
    1999-04-28 → cancelled 2000-07-22
  • MARTIN, WILLIAM H GA
    2001-09-11 → cancelled 2002-04-16
  • FRIEDMAN, SAMUEL G GA
    2013-03-12 → cancelled 2025-03-13
← Back to K4SGF License history →