From: r_delaney2001@yahoo.com   
      
   Say you want to generate a very narrow light   
   band in the UV,  with precise desired frequency.   
   Is it feasible to do so, by starting with a reference   
   microwave signal, then heterodyning up and up,   
   doubling in successive stages?   
      
   What is the limit on this process?  Assume each   
   stage utilizes a technology appropriate for that wavelength.   
      
   --   
   Rich   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)