KR4ORO
Active2x3District 4
Competitive callsign — 1 application filed with the FCC.
License HolderKlauberg, William X
License ClassTechnician
Min. Class RequiredTechnician
LocationArlington, VA
Grant DateAug 29, 2026
Expiration DateAug 29, 2036
KR4ORO is a highly sought-after 2x3 format amateur radio callsign. The license is currently held by Klauberg, William X in Arlington, VA. This callsign has attracted significant interest in the amateur radio community, with 1 vanity application filed with the FCC. The most recent was submitted by Looker, Shawn C on Dec 29, 2025. KR4ORO has 2 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- .-. ....- --- .-. ---
CW Weight: 42 units(Heavy (slower to send))
Voice Phonetics
Kilo Romeo Four Oscar Romeo Oscar
Readability: 6.5/10(Good readability)
License History
- System-Generated GrantAug 29, 2026
- License IssuedAug 29, 2026
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
- Looker, Shawn CFiled Dec 29, 2025Not awardedFCC ↗