I have determined that the RFI I am hearing on 80 and 160 is coming from my new 
Trane XV95 furnace, in particular the DC motor/controller on the "inducer fan". 
 I have been notified by the manufacturer that a shielded cable kit is 
available for installation by a service tech called "KIT14688".  I have not had 
this cable kit installed yet but will let you know if it works.  This is 
evidently a problem with many high efficiency Trane furnaces, not just the XV95.
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