Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4KDR callsign genealogy
Currently held by Knapp, Roger D
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 N4KDR's current licensee, walking backwards.
- Knapp, Roger DNCgranted 2012-03-01cancelled 2013-09-04
Successor callsigns
Callsigns held now by people who previously held N4KDR.
- Williamson, Freida JNCgranted 1996-07-23cancelled 2005-08-20