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WAB : Worked All Britain.
WAC : Worked All Continents.
WAN : Worked All Neighbours. Used to refer to a powerful station in a densely-populated area where strong signals overload broadcast receivers in the immediate vicinity.
WAS : Worked All States. In the US, contacts with stations in each of the fifty US states.
WAVE : Worked All VE. Contacts with stations in each of the Canadian provinces.
Waveguide : A hollow tube, typically square in cross-section, used to carry microwave signals.
Wavelength : The distance in metres between corresponding points on a wave.
WAXE : Worked All XE / México.
WIA : Wireless Institute of Australia. The national organisation for Australian hams.
WKD : CW abbreviation for "worked"
WPM : Words per minute.
WRK : CW abbreviation for "work"
WSPR : Weak Signal Propagation Reporter.
WSJT : Weak Signal Joe Taylor - named after Joe Taylor who wrote the software.
WX : Weather. See weather spotting, APRS for transmission of current meteorological readings via amateur radio. Many 2 metre handheld transceivers are also capable of extended tuning to permit reception of forecasts over VHF bands assigned to other services, such as marine radio.