uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

WA4RRT callsign genealogy

Currently held by Williamson, Freida J

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 WA4RRT's current licensee, walking backwards.

  1. N4KDRexpired· E
    Knapp, Roger DNCgranted 2013-09-04cancelled 2025-09-05
  2. KK4HHZcancelled· G
    Knapp, Roger DNCgranted 2012-03-01cancelled 2013-09-04

Successor callsigns

Callsigns held now by people who previously held WA4RRT.

  1. NQ4Texpired· E
    Williamson, Freida JNCgranted 2005-08-20cancelled 2017-08-22
← Back to WA4RRT License history →