K4SLT
Available1x3District 4
Competitive callsign — 6 applications filed with the FCC.
License HolderCOLORADO STATE UNIVERSITY ARC
Min. Class RequiredGeneral
LocationWindsor, CO
Grant DateMar 28, 2014
Expiration DateMar 28, 2024
Cancellation DateMar 31, 2026
Available for ApplicationsMar 29, 2026
K4SLT is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by COLORADO STATE UNIVERSITY ARC in Windsor, CO. This callsign has attracted significant interest in the amateur radio community, with 6 vanity applications filed with the FCC. The most recent was submitted by Palmer, Richard on Mar 30, 2026. K4SLT has 3 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ....- ... .-.. -
CW Weight: 26 units(Light (fast to send))
Voice Phonetics
Kilo Four Sierra Lima Tango
Readability: 7.5/10(High readability)
This callsign is available now
Requires General license or higher to apply for this callsign format (1x3).
License History
- License ExpiredMar 31, 2026
- License IssuedMar 28, 2014
- Vanity Callsign GrantedMar 28, 2014
Vanity Application Activity
Competing applications filed with the FCC for this callsign.