K3XX
Active1x2District 3
Competitive callsign — 4 applications filed with the FCC.
License HolderGROSSWEILER, KENNETH E
License ClassAmateur Extra
Min. Class RequiredAmateur Extra
LocationPORTLAND, ME
Grant DateJun 13, 2026
Expiration DateJun 17, 2036
K3XX is a highly sought-after 1x2 format amateur radio callsign. The license is currently held by GROSSWEILER, KENNETH E in PORTLAND, ME. This callsign has attracted significant interest in the amateur radio community, with 4 vanity applications filed with the FCC. The most recent was submitted by RUTHERFORD, DANIEL A on May 30, 2006. K3XX has 4 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ...-- -..- -..-
CW Weight: 32 units(Moderate)
Voice Phonetics
Kilo Three X-ray X-ray
Readability: 8.5/10(High readability)
License History
- License RenewedJun 13, 2026
- License RenewedJun 14, 2016
- License RenewedMay 27, 2006
- Administrative Update AppliedMar 14, 2002
Vanity Application Activity
Competing applications filed with the FCC for this callsign.