K3RDU
Available1x3District 3
Competitive callsign — 1 application filed with the FCC.
License HolderSWIDERSKI, JOHN C
License ClassGeneral
Min. Class RequiredGeneral
LocationWARRIORS MARK, PA
Grant DateNov 29, 2003
Expiration DateJan 4, 2014
Cancellation DateJan 5, 2016
Available for ApplicationsJan 5, 2016
K3RDU is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by SWIDERSKI, JOHN C in WARRIORS MARK, PA. This callsign has attracted significant interest in the amateur radio community, with 1 vanity application filed with the FCC. The most recent was submitted by FREGA, CARL N on Jun 15, 2026. K3RDU has 2 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ...-- .-. -.. ..-
CW Weight: 31 units(Moderate)
Voice Phonetics
Kilo Three Romeo Delta Uniform
Readability: 7/10(Good readability)
This callsign is available now
Requires General license or higher to apply for this callsign format (1x3).
License History
- License ExpiredJan 5, 2016
- License RenewedNov 29, 2003
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
- FREGA, CARL NFiled Jun 15, 2026Not awardedFCC ↗