<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=US-ASCII" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 9.00.8112.16540"></HEAD>
<BODY style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" id=role_body
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV><FONT size=4>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.</FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT size=4>73, Herman, N4CH.</FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 3/13/2014 8:37:40 P.M. Eastern Daylight Time,
pbrickey@verizon.net writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>Hi,<BR>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?<BR>73's,<BR>Peter<BR><BR>_______________________________________________<BR>Heath
mailing
list<BR>Heath@puck.nether.net<BR>https://puck.nether.net/mailman/listinfo/heath<BR></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>