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K7OSO

Active1x3District 7

Competitive callsign — 1 application filed with the FCC.

License HolderKOTTKE, LARRY D

License ClassAmateur Extra

Min. Class RequiredGeneral

LocationYuma, AZ

Grant DateNov 22, 2016

Expiration DateFeb 12, 2027

K7OSO is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by KOTTKE, LARRY D in Yuma, AZ. This callsign has attracted significant interest in the amateur radio community, with 1 vanity application filed with the FCC. The most recent was submitted by MANN, DAVID J on May 16, 2025. K7OSO has 4 recorded FCC license history events.

CW & Voice Analysis

Morse Code

-.- --... --- ... ---

CW Weight: 37 units(Moderate)

Voice Phonetics

Kilo Seven Oscar Sierra Oscar

Readability: 7/10(Good readability)

License History

License RenewedNov 22, 2016
Administrative Update AppliedDec 27, 2012
License RenewedDec 16, 2006
FRN Association Email SentNov 6, 2006

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

MANN, DAVID JFiled May 16, 2025
Not awardedFCC ↗

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← K7OSN K7OSP →

FCC data as of Sep 3, 2026

K7OSO FCC Vanity Status: 1 Competing Application & History