K5SIO
Active1x3District 5
Competitive callsign — 1 application filed with the FCC.
License HolderSCHILLING III, RALPH F
License ClassAmateur Extra
Min. Class RequiredGeneral
LocationAllen, TX
Grant DateJul 8, 2025
Expiration DateSep 29, 2035
K5SIO is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by SCHILLING III, RALPH F in Allen, TX. 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 SCHILLING III, RALPH F on Sep 10, 2015. K5SIO has 4 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ..... ... .. ---
CW Weight: 26 units(Light (fast to send))
Voice Phonetics
Kilo Five Sierra India Oscar
Readability: 7/10(Good readability)
License History
- License RenewedJul 8, 2025
- Administrative Update AppliedMar 24, 2020
- License IssuedSep 29, 2015
- Vanity Callsign GrantedSep 29, 2015
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
- SCHILLING III, RALPH FFiled Sep 10, 2015Not awardedFCC ↗