K0ABC
Active1x3District 0
Competitive callsign — 13 applications filed with the FCC.
License HolderSchiefelbein, Mark A
License ClassAmateur Extra
Min. Class RequiredGeneral
LocationWashington, DC
Grant DateNov 6, 2018
Expiration DateFeb 3, 2029
K0ABC is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by Schiefelbein, Mark A in Washington, DC. This callsign has attracted significant interest in the amateur radio community, with 13 vanity applications filed with the FCC. The most recent was submitted by Graham, Randy L on Mar 6, 2026. K0ABC has 8 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ----- .- -... -.-.
CW Weight: 40 units(Moderate)
Voice Phonetics
Kilo Zero Alpha Bravo Charlie
Readability: 7.5/10(High readability)
License History
- Administrative Update AppliedJan 4, 2024
- License RenewedNov 6, 2018
- Administrative Update AppliedJun 12, 2012
- Administrative Update AppliedMar 5, 2009
- License ModifiedFeb 5, 2009
- Vanity Callsign GrantedFeb 3, 2009
- License IssuedFeb 3, 2009
- License ExpiredAug 29, 2008
Vanity Application Activity
Competing applications filed with the FCC for this callsign.