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WAB : Worked All Britain.

WAC : Worked All Continents.

WARC, WRC : World (Administrative) Radio Conference. Run by the International Telecommunications Union.

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.

WARC Bands : Agreed to at the 1979 WARC, they consist of the 30m ( 10.100Mhz - 10.150MHz), 17m (18.086MHz - 18.186MHz) and 12m (24.890MHz - 24.990MHz) amateur bands.

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.