CFCallsignFinder

Search Watchlist

Track FCC amateur radio vanity callsign availability. Data updated daily.

Legal & Info

Pricing FAQ Terms of Service Privacy Policy

© 2026 CallsignFinder. All rights reserved.

FCC data sourced from FCC Universal Licensing System. Not affiliated with the FCC.

Watchlist Search Account

Home/Search/K1SZO

← Back to results

K1SZO

Active1x3District 1

Competitive callsign — 1 application filed with the FCC.

License HolderAPPEL, ROBERT W

License ClassAmateur Extra

Min. Class RequiredGeneral

LocationBoyertown, PA

Grant DateMar 20, 2017

Expiration DateMar 20, 2027

K1SZO is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by APPEL, ROBERT W in Boyertown, PA. 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 BROWN, DAVID C on Feb 28, 2017. K1SZO has 6 recorded FCC license history events.

CW & Voice Analysis

Morse Code

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

CW Weight: 40 units(Moderate)

Voice Phonetics

Kilo One Sierra Zulu Oscar

Readability: 7.5/10(High readability)

License History

Administrative Update AppliedJun 5, 2018
License ModifiedMay 11, 2018
Administrative Update AppliedJul 11, 2017
Administrative Update AppliedMar 22, 2017
License IssuedMar 20, 2017
Vanity Callsign GrantedMar 20, 2017

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

BROWN, DAVID CFiled Feb 28, 2017
Not awardedFCC ↗

Search external databases

QRZ ↗HamQTH ↗

Explore nearby callsigns

← K1SZN K1SZR →

FCC data as of Sep 4, 2026

K1SZO FCC Vanity Status: 1 Competing Application & History