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

K7BSU callsign genealogy

Currently held by SHARP, Roger M

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 K7BSU's current licensee, walking backwards.

  1. K7IVCcancelled· A
    COSTA, CHARLES VIDgranted 2020-08-18cancelled 2022-05-17
  2. K6CVCcancelled· A
    COSTA, CHARLES VIDgranted 2010-08-26cancelled 2020-08-18
  3. WA6EZMcancelled· A
    COSTA, CHARLES VCAgranted 1998-03-23cancelled 2000-10-28

Successor callsigns

Callsigns held now by people who previously held K7BSU.

  1. KE7KMcancelled· E
    COSTA, CHARLES VIDgranted 2023-04-22cancelled 2025-03-04

All historical holders

Every license row we've seen with the callsign K7BSU, oldest first.

  • SHARP, Roger M ID
    2009-04-24 → cancelled 2021-04-27
  • COSTA, CHARLES V ID
    2022-05-17 → cancelled 2023-04-22
← Back to K7BSU License history →