K4JDO
Available1x3District 4
Competitive callsign — 2 applications filed with the FCC.
License HolderBLAIR, JOHN R
License ClassGeneral
Min. Class RequiredGeneral
LocationOCALA, FL
Grant DateSep 13, 2005
Expiration DateDec 11, 2015
Cancellation DateDec 12, 2017
Available for ApplicationsDec 12, 2017
K4JDO is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by BLAIR, JOHN R in OCALA, FL. This callsign has attracted significant interest in the amateur radio community, with 2 vanity applications filed with the FCC. The most recent was submitted by Ogle, Jonathan D on Mar 6, 2026. K4JDO has 3 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ....- .--- -.. ---
CW Weight: 38 units(Moderate)
Voice Phonetics
Kilo Four Juliet Delta Oscar
Readability: 7.5/10(High readability)
This callsign is available now
Requires General license or higher to apply for this callsign format (1x3).
License History
- License ExpiredDec 12, 2017
- Tax ID (TIN) AddedSep 13, 2005
- License RenewedSep 13, 2005
Vanity Application Activity
Competing applications filed with the FCC for this callsign.