[Heath] More on the SB-303 Noise Blanker

[pbrickey at verizon.net]

Hi,
  I think that I had better clarify my first Email.  My SB-303 has a factory labeled front panel which has a labeled Noise Blanker
control where the RF Attenuator control is located.  My manual (a copy)  has instructions for assembling the noise blanker board which has a part number 85-350-2 and is not a small board as it has an IC (CA3012), 6 diodes, and 5 transistors.  The Mixer board has labels on 2 pins labeled NB.  The noise blanker control is a 10K linear control with a switch.  I looked in my 1971 catalogue where the SB-303 is first presented and there is no mention of a noise blanker, however, in the picture of the receiver one can see that the control on the lower right has had its label blanked out. 
   So, I assume that the SB-303 was initially set up with a noise blanker, but that for some reason it was not incorporated in the finished product.

  73's
            Peter    K6dgh