The initial patent for the concept of a separate "noise receiver"
detecting noise and blanking the IF system was issued to Motorola 
for use in their "low band" ... 27 - 54 mHz ... 2-way radios.  They
called it a "range extender", and this was the label on the control
heads that turned the feature on and off.

73! Ken Kopp - K0PP
      elecraftcov...@rfwave.net
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