W7OSO
Active1x3District 7
Competitive callsign — 3 applications filed with the FCC.
License HolderMarbach, Donald E
License ClassGeneral
Min. Class RequiredGeneral
LocationScottsdale, AZ
Grant DateMay 24, 2022
Expiration DateMay 24, 2032
W7OSO is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by Marbach, Donald E in Scottsdale, AZ. This callsign has attracted significant interest in the amateur radio community, with 3 vanity applications filed with the FCC. The most recent was submitted by MANN, DAVID J on May 16, 2025. W7OSO has 5 recorded FCC license history events.
CW & Voice Analysis
Morse Code
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CW Weight: 37 units(Moderate)
Voice Phonetics
Whiskey Seven Oscar Sierra Oscar
Readability: 7/10(Good readability)
License History
- License IssuedMay 24, 2022
- Vanity Callsign GrantedMay 24, 2022
- License ExpiredMay 5, 2022
- License IssuedMay 4, 2010
- Vanity Callsign GrantedMay 4, 2010
Vanity Application Activity
Competing applications filed with the FCC for this callsign.