K4MTR
Unknown1x3Zone 4
License HolderWATT, MARTIN D
License ClassAmateur Extra
Min. Class RequiredGeneral
Requires General license or higher to apply for this callsign format (1x3).
License History
- License RenewedApr 9, 2026
- License ModifiedFeb 21, 2024
- Administrative Update AppliedApr 21, 2023
- License ModifiedAug 6, 2018
- License IssuedJul 2, 2016
- Vanity Callsign GrantedJul 2, 2016
- License CanceledJun 6, 2006
- Administrative Update AppliedAug 11, 2005
- Administrative Update AppliedJun 22, 2005
- Vanity Callsign GrantedJan 4, 2005
- License IssuedJan 4, 2005
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
No competing applications detected. Monitor the FCC ULS application search to verify before filing.