Duane,
That information has been superseded. There was a lot of activity "way
back when" to reduce the filter 'blowby'. Since that time there have
been several changes in the filter - the filter crystals were spec'ed
better between Elecraft and their crystal vendor (started with SN 2560),
the crystals are now grounded near the base and on both sides of the
crystal body. In addition winding ratio of transformer T7 was changed
to better match the IF amplifier input to the crystal filter.
All of these things contribute to a better CW filter in the K2. I
would not apply any of the old remedies on a new K2. If you have an
older K2, then first bring it up to the current level crystals and
grounding and check/change the T7 winding ratio. Then you will be in a
position to experiment a bit if you want to make it better.
73,
Don W3FPR
dw wrote:
> Hi Gang,
> I searched the archives but couldn't find anything on this question.
> A few days ago I browsed into a web-site where a K2 owner described what
> looked like a modified grounding scheme for the crystal filter cans,
> saying that it reduced or eliminated what was described as "underwater
> noise"
>
> The article showed grounding strips bridging all of the crystal cans
> together, and I think there was a couple of filter caps added.
>
> Does anyone know if this grounding scheme was ever considered seriously
> as an addition to the standard K2 building process?
>
> Thanks
> Duane
>
>
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