From: liz@poppyrecords.invalid.invalid   
      
   Dave Platt  wrote:   
      
   > In article <1roie0z.jm7cb9p08gn4N%liz@poppyrecords.invalid.invalid>,   
   > Liz Tuddenham  wrote:   
   >   
   > >At 200 c/s switching frequency, 1N4148 sounds far more attractive -   
   > >eapecially as I have a drawer full of them.   
   >   
   > The Ramsey DF1 Doppler direction finder works by switching an array   
   > of four dipole antennas into and out of the receiver circuit, using   
   > 1N4148 diodes as switches, at a rate of 1 kHz.   
   >   
   > I haven't heard of any of these wearing out :-)   
   >   
   > The DF1 works fine at 2-meter frequencies, and I can recall using   
   > in the 70 cm band as well.   
      
   I wondered if I might be re-inventing the wheel but couldn't find an   
   exact equivalent already in existence.  There are three questions with   
   this system:   
      
   1)  Is it likely to work?  I think you have answered that with a "Yes" -   
   as long as I can engineer it correctly.   
      
   2)  If it works, what use is it.  I envisige it being used for DF-ing   
   faint signals.   
      
   3)  Who would want to DF faint signals?  I don't know the answer to   
   that, so it looks as though I have invented a solution that is looking   
   for a problem.   
      
      
   --   
   ~ Liz Tuddenham ~   
   (Remove the ".invalid"s and add ".co.uk" to reply)   
   www.poppyrecords.co.uk   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)