KB4SLR
Available2x3District 4
Competitive callsign — 2 applications filed with the FCC.
License HolderJOHNSON, MARTIN E
License ClassAmateur Extra
Min. Class RequiredTechnician
LocationWEST RIVER, MD
Grant DateApr 3, 1996
Expiration DateApr 3, 2006
Cancellation DateApr 4, 2008
Available for ApplicationsApr 4, 2008
KB4SLR is a highly sought-after 2x3 format amateur radio callsign. The license is currently held by JOHNSON, MARTIN E in WEST RIVER, MD. This callsign has attracted significant interest in the amateur radio community, with 2 vanity applications filed with the FCC. The most recent was submitted by Rios, Seth L on Feb 11, 2026. KB4SLR has 1 recorded FCC license history event.
CW & Voice Analysis
Morse Code
-.- -... ....- ... .-.. .-.
CW Weight: 34 units(Moderate)
Voice Phonetics
Kilo Bravo Four Sierra Lima Romeo
Readability: 6.5/10(Good readability)
This callsign is available now
Requires Technician license or higher to apply for this callsign format (2x3).
License History
- License ExpiredApr 4, 2008
Vanity Application Activity
Competing applications filed with the FCC for this callsign.