Have we, in fact, established that this attenuator is enabled at any point of 
the tune cycle? Because if not, then we're all spun up for nothing.
Is it reasonable to believe that the attenuator was one of those design 
elements that might have been deemed necessary at one time but then the 
designers changed their mind for the finished product?  I think so. The 
mysterious R7 may have been left off of the final circuit board precisely to 
cause such a bad mismatch that it would be obvious to operator, software, or 
both, and so that corrective action could be taken.
Al  W6LX/4




   
  
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