K0ISU
Available1x3District 0
Competitive callsign — 5 applications filed with the FCC.
License HolderPrins, Joshua M
License ClassAmateur Extra
Min. Class RequiredGeneral
LocationHartland, WI
Grant DateAug 15, 2017
Expiration DateSep 5, 2027
Cancellation DateFeb 13, 2024
Available for ApplicationsFeb 14, 2026
K0ISU is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by Prins, Joshua M in Hartland, WI. This callsign has attracted significant interest in the amateur radio community, with 5 vanity applications filed with the FCC. The most recent was submitted by Prins, Joshua M on Aug 17, 2007. K0ISU has 7 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ----- .. ... ..-
CW Weight: 32 units(Moderate)
Voice Phonetics
Kilo Zero India Sierra Uniform
Readability: 6/10(Good readability)
This callsign is available now
Requires General license or higher to apply for this callsign format (1x3).
License History
- License CanceledFeb 13, 2024
- License ModifiedSep 26, 2022
- License RenewedAug 15, 2017
- Administrative Update AppliedFeb 20, 2013
- Administrative Update AppliedJun 17, 2008
- License IssuedSep 5, 2007
- Vanity Callsign GrantedSep 5, 2007
Vanity Application Activity
Competing applications filed with the FCC for this callsign.