KO4OSJ
Active2x3District 4
No competing applications on record.
License HolderSullivan, Charles D
License ClassGeneral
Min. Class RequiredTechnician
LocationIndianapolis, IN
Grant DateMar 25, 2021
Expiration DateMar 25, 2031
KO4OSJ is a 2x3 format amateur radio callsign. It is currently registered to Sullivan, Charles D in Indianapolis, IN. There are currently no competing vanity applications or pending FCC filings on record for this callsign. Add it to your watchlist to receive an immediate alert if another operator files a vanity application.
CW & Voice Analysis
Morse Code
-.- --- ....- --- ... .---
CW Weight: 45 units(Heavy (slower to send))
Voice Phonetics
Kilo Oscar Four Oscar Sierra Juliet
Readability: 6.5/10(Good readability)
License History
- License ModifiedJul 13, 2026
- License ModifiedJun 15, 2026
- System-Generated GrantMar 25, 2021
- License IssuedMar 25, 2021
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
No competing applications on record. Verify on the FCC ULS application search before filing.