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I have two SB303's...one has the added SB104 noise blanker.<br>
The details you describe sounds like you have one of the several
Heath items that <br>
were never sold, or only a few beta test units were built. <br>
Perhaps one of the ex "hams at Heath" can chime in and enlighten us
all!!<br>
<br>
....Dave<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 3/14/2014 12:15 PM,
<a class="moz-txt-link-abbreviated" href="mailto:pbrickey@verizon.net">pbrickey@verizon.net</a> wrote:<br>
</div>
<blockquote
cite="mid:21680216.777362.1394813714000.JavaMail.root@vznit170080"
type="cite">
<pre wrap="">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
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</blockquote>
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