K4LOS
Expired1x3District 4
Competitive callsign — 2 applications filed with the FCC.
License HolderMADRID, CARLOS J
License ClassTechnician
Min. Class RequiredGeneral
LocationKlamath Falls, OR
Grant DateOct 15, 2014
Expiration DateOct 15, 2024
Available for ApplicationsOct 16, 2026
K4LOS is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by MADRID, CARLOS J in Klamath Falls, OR. 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 MADRID, CARLOS J on Sep 26, 2014. K4LOS has 4 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ....- .-.. --- ...
CW Weight: 32 units(Moderate)
Voice Phonetics
Kilo Four Lima Oscar Sierra
Readability: 7.5/10(High readability)
Available Oct 16, 2026 (99 days remaining)
Requires General license or higher to apply for this callsign format (1x3).
License History
- Administrative Update AppliedJul 29, 2015
- Administrative Update AppliedJan 17, 2015
- License IssuedOct 15, 2014
- Vanity Callsign GrantedOct 15, 2014
Vanity Application Activity
Competing applications filed with the FCC for this callsign.