Confidence: Medium · Source: FCC ULS · As of 2026-09-09
K4YXJ callsign genealogy
Currently held by LOEWENTHAL, ROBERT 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 K4YXJ's current licensee, walking backwards.
- LOEWENTHAL, ROBERT JGAgranted 2009-03-19cancelled 2012-09-25
Successor callsigns
Callsigns held now by people who previously held K4YXJ.
No current licensee on record previously held this callsign.