A Really Cool Idea: Use your BFO as your Arduino DDS Clock

 (21) If you add a microprocessor chip to augment some of the BITX 
 
 functions, it might be advisable to use the 10 MHZ BFO signal to clock 
 
 your uP. This could help avoid unwanted 'birdies' from the uP oscillator 
 
 getting into your BITX circuitry.
 
From a nice list of BITX mods: 
 
http://kambing.ui.ac.id/onnopurbo/orari-diklat/teknik/homebrew/bitx20/modifications/LIST%20(9-24-04).txt
 
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