[Laser] 5th grid XE2AT

[Chris L]

   There  are  reservations  about exactly what constitutes a record. For
   speech,  I  think  it  remains  at  118  miles,  set  by  W6POP of the
   Electro-Optics  Systems Radio Club with a HeNe laser back in May 1963.
   That was done across the Mojave desert in California - see my web site
   for more:

   http://www.bluehaze.com.au/modlight

   All of the longer distances covered in, for instance, the 1991 records
   were  set  with either MCW or digital techniques. At least, I think so
   ... unless someone has evidence to the contrary...

   Diode  lasers were reasonably affordable in 1991, but yes, HeCd lasers
   were  used  because  their  blue-violet  output matches the wavelength
   range of spectral sensitivity for photomultipliers.

   In Australia, the speech DX record remains at 104 miles (167.7 km) set
   by  VK7MJ,  VK7JG  and myself in February of this year. It's a bit wet
   and  cold  here  during  the  Australian  Winter, but we hope for even
   better this coming Spring. We have already lined up an optical path of
   205 km, just have to wait for the snow to thaw out on Mount Buffalo to
   try it.

   Chris Long, Melbourne Australia (and Dave Smith VK3HZ).
       ______________________________________________________________

     From:  "Andrew T. Flowers, K0SM" <aflowers at frontiernet.net>
     Reply-To:  Free Space LASER Communications <laser at mailman.qth.net>
     To:  Free Space LASER Communications <laser at mailman.qth.net>
     Subject:  Re: [Laser] 5th grid XE2AT
     Date:  Thu, 25 Aug 2005 17:10:02 -0400
     >Al,
     >
     >I think the record in the US was made using 20- or 50 mw HeCd
     >lasers.  This was done before semiconductor lasers were widely
     >affordable.
     >
     >Andy K0SM/2
     >
     >>Pd  someone  know  the  power  used  to  get the records in North
     America
     >>from the neighbors of USA ?
     >
     >
     >
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