The minelab xp and sd series have a multistep waveform " the long pulse width is a bit under 240usec and the 3 short pulses are just under 60usec " (taken from another website)
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http://www.minelabmods.com/joomla/index.php?option=com_kunena&Itemid=53&func=view&catid=2&id=628&widthstyle=w-thin
The reason for this is the long pulse is for ground balance and the shorter pulses are for detection..
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http://www.thunting.com/smf/index.php/topic,10932.msg136714.html#msg136714
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