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The Super Dual Auroral Radar Network (SuperDARN), which consists of networks ofHF radars surrounding the northern and southern poles, has proven to be an extremelysuccessful experimental technique in a wide range of scientific areas.  The basicdesign of the radars, which contributes to SuperDARN, has remained virtuallyunchanged since the first radar was built in the early 1980s.  This paper presents thefirst results of a significant new development of the basic system.  Termed "Stereo",this development involves the addition of a duplicate receive channel and makes useof the spare duty cycle available in the current transmitters.  The Stereo system has beenimplemented on the two radars that form the Co-operative UK Twin Located AuroralSounding System (CUTLASS), which are the easternmost pair of radars in theNorthern Hemisphere SuperDARN chain.  Instead of the standard 7 pulse sequencenormally employed by the radars, two such pulse sequences are interleaved andtransmitted at different frequencies separated by more than 15kHz.  Thisdevelopment allows for the radar to run two entirely different experimental modessimultaneously.  Here we describe the basic Stereo system and some of the earlyresults.  We also identify potential new experiments which could be run with Stereo tocomplement the existing standard SuperDARN radar.<BR><BR><b>Key words.</b> Ionosphere (ionosphere-magnetosphere interactions;ionospheric irregularities; instruments and techniques

Stereo CUTLASS - A new capability for the SuperDARN HF radars