W3MDH
Active1x3District 3
Competitive callsign — 6 applications filed with the FCC.
License HolderHeckendorn, Mark D
License ClassGeneral
Min. Class RequiredGeneral
LocationVentura, CA
Grant DateNov 14, 2023
Expiration DateNov 14, 2033
W3MDH is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by Heckendorn, Mark D in Ventura, CA. This callsign has attracted significant interest in the amateur radio community, with 6 vanity applications filed with the FCC. The most recent was submitted by Hess, Michael D on Jan 29, 2026. W3MDH has 8 recorded FCC license history events.
CW & Voice Analysis
Morse Code
.-- ...-- -- -.. ....
CW Weight: 31 units(Moderate)
Voice Phonetics
Whiskey Three Mike Delta Hotel
Readability: 8.5/10(High readability)
License History
- License RenewedNov 14, 2023
- License ModifiedOct 27, 2017
- License RenewedAug 23, 2013
- Administrative Update AppliedMar 31, 2009
- Administrative Update AppliedAug 1, 2006
- FRN Association Email SentJul 28, 2006
- License IssuedSep 27, 2003
- Vanity Callsign GrantedSep 27, 2003
Vanity Application Activity
Competing applications filed with the FCC for this callsign.