SB-303 puzzle

[Stephen C. Finch]

I think it was an add on noise blanker.  It worked well on repetitive noise like ignition
noise but no too well on other noise.  I also downgraded the 3rd order intercept so much
that many uninstalled it.

Steve Finch
AI0W, and former SB-303 owner

Chuck Penson wrote:

> Gang,
>
> A friend of mine recently aquired an SB-303 with a curious mod.
>
> The unit has an extra pc board with a Heath part number -- 85-1412-3.
>
> Seems to be an option of some kind. It has an on/off switch and mounts
> above the crystal filters next to the LMO.  Doesn't seem to do anything
> obvious.
>
> Any ideas?
>
> Thanks!
>
> Chuck / WA7ZZE
>
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