KC4JMB
Available2x3District 4
Competitive callsign — 1 application filed with the FCC.
License HolderCASTILLO, GREGORIO A
License ClassNovice
Min. Class RequiredTechnician
LocationMIAMI, FL
Grant DateMar 28, 1989
Expiration DateMar 28, 1999
Cancellation DateMar 29, 2001
Available for ApplicationsMar 29, 2001
KC4JMB is a highly sought-after 2x3 format amateur radio callsign. The license is currently held by CASTILLO, GREGORIO A in MIAMI, FL. 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 Burke, Jason on Feb 4, 2026. KC4JMB has 1 recorded FCC license history event.
CW & Voice Analysis
Morse Code
-.- -.-. ....- .--- -- -...
CW Weight: 44 units(Heavy (slower to send))
Voice Phonetics
Kilo Charlie Four Juliet Mike Bravo
Readability: 7.5/10(High readability)
This callsign is available now
Requires Technician license or higher to apply for this callsign format (2x3).
License History
- License ExpiredMar 29, 2001
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
- Burke, JasonFiled Feb 4, 2026Not awardedFCC ↗