A new version 0.9b of vlfrx-tools is available at

  http://abelian.org/vlfrx-tools/

This version has some significant improvements -

- vttime now has options to use a short or long rectangular
  GPS pulse-per-second, with timing methods -m pulse for
  short (circa 10uS pulses) and -m edge for long (100mS)
  pulses.

- vtspot can now carry out sferic matching on batches of TOGAs
  from vttoga.   It does the complicated job of working out
  which sferics belong to which lightning stroke as it solves
  for the lightning locations.  It can cope with up to a couple
  of hundred receivers with an aggregate rate of 170 sferics per
  second.  When given raw TOGAs from over 60 WWLLN receivers, it
  produces a respectable looking world lightning map.

The changes to vttime will make it simpler to use vlfrx-tools,
especially if you have a GPS with only a fixed 10uS or 100mS PPS
width.

--
Paul Nicholson
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