K4MRJ
Active1x3District 4
Competitive callsign — 2 applications filed with the FCC.
License HolderJohnson, Mark R
License ClassGeneral
Min. Class RequiredGeneral
LocationMcKinleyville, CA
Grant DateSep 11, 2025
Expiration DateOct 23, 2035
K4MRJ is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by Johnson, Mark R in McKinleyville, CA. 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 Johnson, Mark R on Oct 5, 2015. K4MRJ has 4 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ....- -- .-. .---
CW Weight: 35 units(Moderate)
Voice Phonetics
Kilo Four Mike Romeo Juliet
Readability: 7.5/10(High readability)
License History
- License RenewedSep 11, 2025
- License IssuedOct 23, 2015
- Vanity Callsign GrantedOct 23, 2015
- License ExpiredJul 28, 2010
Vanity Application Activity
Competing applications filed with the FCC for this callsign.