Merlin,
We have known for some time that the presence of the KSB2 filter reduces the
ultimate rejection of the CW filter too. Perhaps you have created a 'cure'.
Could you put a picture somewhere that we can see it? If not, I may be able
to put it up on my website for all to see. (attachments to the reflector
will be stripped off)
73,
Don W3FPR
----- Original Message -----
...
Enough reminiscing; I just spent about a hour with my KSB2, making sure
that the solder connections near the 7 pole filter were filed down, or
clipped
as much as possible, so that they don't act as little "antennas", thus
messing
up the characteristics of the filter. It worked! The "audio image" that
one hears when tuning past zero beat got a lot weaker!
Next, I went to local hobby shop and bought some tin. I made little tin
"houses" which I placed around the matching toroids, ground them
carefully. It
worked too. Next I added a little tin "fence" which went on the bottom
the
board, shielding the input of the filter from the output. It worked.
Three
times is a charm!
My point: it ain't rocket science, but the old ideas of keeping RF away
from places where it shouldn't be work just as well as they ever did.
I don't have means of measuring this stuff accurately. Let's just say
that
when tuning across really loud forty meter broadcast stations the filter
sounds A LOT tighter then it did.
Has anybody else tried this stuff. There must be hundreds of you old
guys
who have messed with such things.
So, until Elecraft finds a way to put a bulletproof 8 pole filter in its
magnificent radio it's time to improvise a little.
73,
Merlin W3ICT
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