KC4JAX
Active2x3District 4
Competitive callsign — 3 applications filed with the FCC.
License HolderGreenberg, Jeffrey A
License ClassTechnician
Min. Class RequiredTechnician
LocationCalabasas, CA
Grant DateJun 14, 2025
Expiration DateJun 14, 2035
KC4JAX is a highly sought-after 2x3 format amateur radio callsign. The license is currently held by Greenberg, Jeffrey A in Calabasas, CA. This callsign has attracted significant interest in the amateur radio community, with 3 vanity applications filed with the FCC. The most recent was submitted by Couture Sr, John C on May 27, 2025. KC4JAX has 5 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- -.-. ....- .--- .- -..-
CW Weight: 44 units(Heavy (slower to send))
Voice Phonetics
Kilo Charlie Four Juliet Alpha X-ray
Readability: 7/10(Good readability)
License History
- License ModifiedFeb 17, 2026
- License ModifiedFeb 13, 2026
- License IssuedJun 14, 2025
- Vanity Callsign GrantedJun 14, 2025
- License ExpiredApr 26, 2001
Vanity Application Activity
Competing applications filed with the FCC for this callsign.