KC1SOW
Active2x3District 1
Competitive callsign — 1 application filed with the FCC.
License HolderKlemm, Mark S
License ClassGeneral
Min. Class RequiredTechnician
LocationDanville, NH
Grant DateSep 20, 2025
Expiration DateSep 20, 2035
KC1SOW is a highly sought-after 2x3 format amateur radio callsign. The license is currently held by Klemm, Mark S in Danville, NH. 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 Klemm, Mark S on Sep 2, 2025. KC1SOW has 6 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- -.-. .---- ... --- .--
CW Weight: 47 units(Heavy (slower to send))
Voice Phonetics
Kilo Charlie One Sierra Oscar Whiskey
Readability: 7/10(Good readability)
License History
- License IssuedSep 20, 2025
- Vanity Callsign GrantedSep 20, 2025
- License CanceledMay 30, 2025
- License ModifiedJun 27, 2023
- System-Generated GrantMar 3, 2023
- License IssuedMar 3, 2023
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
- Klemm, Mark SFiled Sep 2, 2025Not awardedFCC ↗