[Heath] SB-303 Noise Blanker

N4ch at aol.com N4ch at aol.com
Thu Mar 13 21:31:46 EDT 2014

I don't think Heath ever sold a noise blanker for  the SB-303 receiver, 
either included with the basic receiver kit, or as an  add-on accessory (like 
the optional CW and AM filters).   The SB-104/A  SSB transceivers DID have an 
optional noise blanker which could be added, and  back in the late 70s and 
early 80s a common mod for the SB-303 was to buy a  blanker kit (which was 
intended for the SB-104), and wire it into the '303  receiver.   I don't 
think Heath ever encouraged or supported doing  this, but the modification was 
written up in one of the ham mags some 35 years  ago (I can't recall which 
one), and I actually modified a couple such receivers,  and the results were 
pretty good, as I recall.   I think the RF  attenuator was standard on ALL 
SB-303 receivers that Heath shipped, but the  blanker was standard on none.
73, Herman, N4CH.
In a message dated 3/13/2014 8:37:40 P.M. Eastern Daylight Time,  
pbrickey at verizon.net writes:

My SB-303 has a Noise Blanker control in place of the RF  attenuator 
control, but the noise blanker board is missing. Does anybody have  an idea of why 
Heathkit eliminated the noise blanker and substituted the RF  attenuator? 
Anyone have a SB-303 noise blanker  board?

Heath  mailing  list
Heath at puck.nether.net

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