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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.

RUTHERFORD, DANIEL AFiled May 30, 2006
DismissedFCC ↗
RUTHERFORD, DANIEL AFiled May 25, 2006
DismissedFCC ↗
RUTHERFORD, DANIEL AFiled May 22, 2006
DismissedFCC ↗
RUTHERFORD, DANIEL AFiled May 19, 2006

Search external databases

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FCC data as of Sep 4, 2026

DismissedFCC ↗

K3XX FCC Vanity Status: 4 Competing Applications & History