KO4SR
Available2x2District 4
Competitive callsign — 2 applications filed with the FCC.
License HolderTYMICK, JOHN M
License ClassAmateur Extra
Min. Class RequiredGeneral
LocationRacine, WI
Grant DateAug 7, 2002
Expiration DateOct 6, 2012
Cancellation DateFeb 9, 2010
Available for ApplicationsFeb 10, 2012
KO4SR is a highly sought-after 2x2 format amateur radio callsign. The license is currently held by TYMICK, JOHN M in Racine, WI. 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 Rumplik, Steven on Aug 18, 2025. KO4SR has 6 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- --- ....- ... .-.
CW Weight: 31 units(Moderate)
Voice Phonetics
Kilo Oscar Four Sierra Romeo
Readability: 7/10(Good readability)
This callsign is available now
Requires General license or higher to apply for this callsign format (2x2).
License History
- License CanceledFeb 9, 2010
- Administrative Update AppliedOct 13, 2007
- License RenewedAug 7, 2002
- Administrative Update AppliedJul 26, 2001
- Administrative Update AppliedJul 24, 2001
- Administrative Update AppliedJul 24, 2001
Vanity Application Activity
Competing applications filed with the FCC for this callsign.