K4SX
Active1x2District 4
Competitive callsign — 3 applications filed with the FCC.
License HolderLowrance, Ronald D
License ClassAmateur Extra
Min. Class RequiredAmateur Extra
LocationWright City, MO
Grant DateAug 10, 2016
Expiration DateNov 4, 2026
K4SX is a highly sought-after 1x2 format amateur radio callsign. The license is currently held by Lowrance, Ronald D in Wright City, MO. This callsign has attracted significant interest in the amateur radio community, with 3 vanity applications filed with the FCC. The most recent was submitted by Tineo, Jesus E on May 20, 2026. K4SX has 7 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ....- ... -..-
CW Weight: 25 units(Light (fast to send))
Voice Phonetics
Kilo Four Sierra X-ray
Readability: 8/10(High readability)
License History
- Administrative Update AppliedFeb 24, 2026
- License RenewedAug 10, 2016
- Administrative Update AppliedJul 19, 2016
- License RenewedAug 10, 2006
- Administrative Update AppliedApr 21, 2006
- Administrative Update AppliedJul 6, 2000
- Administrative Update AppliedFeb 12, 2000
Vanity Application Activity
Competing applications filed with the FCC for this callsign.