[Heath] More on the SB-303 Noise Blanker

[Dave Edwards]

I have two SB303's...one has the added SB104 noise blanker.
The details you describe sounds like you have one of the several Heath 
items that
were never sold, or only a few beta test units were built.
Perhaps one of the ex "hams at Heath" can chime in and enlighten us all!!

....Dave



On 3/14/2014 12:15 PM, pbrickey at verizon.net wrote:
> 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
> _______________________________________________
> Heath mailing list
> Heath at puck.nether.net
> https://puck.nether.net/mailman/listinfo/heath
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/heath/attachments/20140314/b34d09cd/attachment-0001.html>