Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KV4J callsign genealogy
Currently held by FRIEDERICH, RUDOLF 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 KV4J's current licensee, walking backwards.
- Jerman II, John LALgranted 2017-08-01cancelled 2026-02-07
Successor callsigns
Callsigns held now by people who previously held KV4J.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KV4J, oldest first.
- MACEY SR, RICHARD F NC2004-03-11 → cancelled 2011-10-20
- FRIEDERICH, RUDOLF J TN2013-11-09 → cancelled 2024-02-11
- Jerman II, John L AL2026-02-07 active