K4KOO
Cancelled1x3District 4
Competitive callsign — 1 application filed with the FCC.
License HolderENGELMAN, JACOB
License ClassAmateur Extra
Min. Class RequiredGeneral
LocationCLEARWATER, FL
Grant DateMay 23, 2023
Cancellation DateDec 6, 2024
Available for ApplicationsDec 7, 2026
K4KOO is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by ENGELMAN, JACOB in CLEARWATER, FL. 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 ENGELMAN, JACOB on May 5, 2023. K4KOO has 9 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ....- -.- --- ---
CW Weight: 39 units(Moderate)
Voice Phonetics
Kilo Four Kilo Oscar Oscar
Readability: 8/10(High readability)
Available Dec 7, 2026 (94 days remaining)
Requires General license or higher to apply for this callsign format (1x3).
License History
- License CanceledDec 6, 2024
- License ModifiedSep 28, 2023
- License ModifiedAug 11, 2023
- License IssuedMay 23, 2023
- Vanity Callsign GrantedMay 23, 2023
- License ExpiredMay 10, 2022
- License RenewedMar 1, 2010
- License RenewedMay 5, 2000
- License ModifiedApr 25, 2000
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
- ENGELMAN, JACOBFiled May 5, 2023Not awardedFCC ↗