Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF3U callsign genealogy
Currently held by CLARK, KARL S
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 KF3U's current licensee, walking backwards.
- CLARK, KARL SVAgranted 2007-08-14cancelled 2010-01-26
Successor callsigns
Callsigns held now by people who previously held KF3U.
- Cleveland Jr, Ralph JCAgranted 2002-08-31cancelled 2006-03-31
All historical holders
Every license row we've seen with the callsign KF3U, oldest first.
- Cleveland Jr, Ralph J CA1999-04-19 → cancelled 2002-08-31
- CLARK, KARL S VA2019-10-31 active