KR4OK
Active2x2District 4
Competitive callsign — 2 applications filed with the FCC.
License HolderALDERFER, JEFFREY M
License ClassAdvanced
Min. Class RequiredGeneral
LocationHarleysville, PA
Grant DateSep 25, 2018
Expiration DateDec 23, 2028
KR4OK is a highly sought-after 2x2 format amateur radio callsign. The license is currently held by ALDERFER, JEFFREY M in Harleysville, PA. 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 ALDERFER, JEFFREY M on Dec 4, 2008. KR4OK has 12 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- .-. ....- --- -.-
CW Weight: 35 units(Moderate)
Voice Phonetics
Kilo Romeo Four Oscar Kilo
Readability: 7.5/10(High readability)
License History
- Administrative Update AppliedJul 25, 2025
- Administrative Update AppliedJul 25, 2025
- Administrative Update AppliedJul 25, 2025
- Administrative Update AppliedAug 25, 2021
- Administrative Update AppliedAug 23, 2021
- License RenewedSep 25, 2018
- License IssuedDec 23, 2008
- Vanity Callsign GrantedDec 23, 2008
- License CanceledApr 22, 2008
- Vanity Callsign GrantedNov 1, 2003
- License IssuedNov 1, 2003
- License Canceled
Vanity Application Activity
Competing applications filed with the FCC for this callsign.